HVAC Code Lookup

Bryant fault codes

39 documented codes for Bryant furnaces, each cited to the manufacturer's own manual. Find your code in the table, then jump to what it means, the likely causes, what you can safely check, and when to call a technician.

Bryant is a Carrier (ICP) brand and uses the same furnace control boards and the same status-code numbering as Carrier and Payne. A Bryant 926 flashes the same code numbers as the equivalent Carrier 58-series furnace.

Looking it up by flash count?

If you counted LED flashes rather than reading a code number, these are the codes that start with that many flashes:

  • 1 flashes: 10.1 (L1 polarity fault), 12.1 ("W" on at power up - normal operation), 13.1 (Limit circuit lockout), 14.1 (Ignition lockout), 14.2 (Flame lost - the flame signal dropped out three times after 70 seconds of heating), 14.3 (Lockout after seven loss-of-flame events during a single heat request), 15.1 (Blower RPM lockout), 19.1 (InteliSense communication loss - the furnace control has lost communication with the ecobee for Bryant thermostat)
  • 2 flashes: 21.1 (24 VAC was sensed on the gas valve when it should not be there), 22.1 (False flame), 23.1 (Stuck-closed main pressure switch), 23.2 (Stuck-closed secondary), 23.4 (Low-heat), 24.1 (Fuse fault - the 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiring), 25.1 (No program information in the control's microprocessor - the furnace will not heat), 25.2 (Corrupted program file), 25.3 (Twinned units are not identical - the two furnaces' program numbers do not match, so the main unit will not operate), 25.4 (Main program invalid - the control is running on its backup program), 25.5 (Installer settings corrupted), 25.6 (Wrong program for the control being used - there is no heating operation until the control is reprogrammed to match), 25.7 (A non-condensing program was detected in a condensing model furnace), 27 (The program in the super plug is missing, not recognized, or corrupted)
  • 3 flashes: 31.2 (Open secondary pressure switch), 31.3 (Secondary pressure switch lockout - the secondary), 31.6 (Open secondary pressure switch - the high-heat pressure switch did not close for one minute after the gas valve closed, or it has reopened), 31.7 (High heat only for the next cycle - the high-heat pressure switch failed to close within 75 seconds while transitioning from low to high heat), 32.1 (Open main pressure switch), 32.2 (Open main pressure switch), 33.1 (A switch has opened in the main limit circuit - the limit or flame rollout switch is open), 33.2 (Lockout to high heat only for the current cycle, following limit circuit trips), 34.1 (Ignition fault during four consecutive ignition trials - the furnace tried to light four times without proving flame), 34.2 (After successful ignition), 34.3 (After successful ignition)
  • 4 flashes: 41 (No blower RPM), 45.1 (Control failure - flame circuit fault, memory mismatch, or sequence error on the control board), 45.2 (Control failure - the gas valve relay will not close), 45.3 (Control failure - EEPROM memory issue on the control board), 46.1 (Momentary loss of power)
  • 5 flashes: 52.1 / 52.2 (Supply Air Temperature)

Furnace codes

CodeMeaningSeverity
10.1Rapid, continuous flashing with no pause; display reads 10.1L1 polarity faultHard lockout
12.11 short flash, 2 long flashes"W" on at power up - normal operationStatus
13.11 short flash, 3 long flashesLimit circuit lockoutSoft lockout
14.11 short flash, 4 long flashesIgnition lockoutSoft lockout
14.2Major code 14 flashed on the LED (1 short, 4 long); 14.2 on the displayFlame lost - the flame signal dropped out three times after 70 seconds of heatingSafety fault
14.3Major code 14 flashed on the LED (1 short, 4 long); 14.3 on the displayLockout after seven loss-of-flame events during a single heat requestSafety fault
15.11 short flash, 5 long flashesBlower RPM lockoutSoft lockout
19.11 short flash, 9 long flashesInteliSense communication loss - the furnace control has lost communication with the ecobee for Bryant thermostatWarning
21.12 short flashes, 1 long flash24 VAC was sensed on the gas valve when it should not be thereHard lockout
22.12 short flashes, 2 long flashesFalse flameSafety fault
23.12 short flashes, 3 long flashesStuck-closed main pressure switchWarning
23.2Major code 23 flashed on the LED (2 short, 3 long); 23.2 on the displayStuck-closed secondaryWarning
23.4Major code 23 flashed on the LED (2 short, 3 long); 23.4 on the displayLow-heatWarning
24.12 short flashes, 4 long flashesFuse fault - the 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiringHard lockout
25.12 short flashes, 5 long flashesNo program information in the control's microprocessor - the furnace will not heatHard lockout
25.2Major code 25 flashed on the LED (2 short, 5 long); 25.2 on the displayCorrupted program fileHard lockout
25.3Major code 25 flashed on the LED (2 short, 5 long); 25.3 on the displayTwinned units are not identical - the two furnaces' program numbers do not match, so the main unit will not operateHard lockout
25.4Major code 25 flashed on the LED (2 short, 5 long); 25.4 on the displayMain program invalid - the control is running on its backup programWarning
25.5Major code 25 flashed on the LED (2 short, 5 long); 25.5 on the displayInstaller settings corruptedWarning
25.6Major code 25 flashed on the LED (2 short, 5 long); 25.6 on the displayWrong program for the control being used - there is no heating operation until the control is reprogrammed to matchHard lockout
25.7Major code 25 flashed on the LED (2 short, 5 long); 25.7 on the displayA non-condensing program was detected in a condensing model furnaceHard lockout
272 short flashes, 7 long flashes; minor codes 27.1, 27.2 and 27.3The program in the super plug is missing, not recognized, or corruptedHard lockout
31.23 short flashes, 1 long flash; 31.2 on the displayOpen secondary pressure switchWarning
31.3Major code 31 on the LED (3 short, 1 long); 31.3 on the displaySecondary pressure switch lockout - the secondarySoft lockout
31.6Major code 31 on the LED (3 short, 1 long); 31.6 on the displayOpen secondary pressure switch - the high-heat pressure switch did not close for one minute after the gas valve closed, or it has reopenedWarning
31.7Major code 31 on the LED (3 short, 1 long); 31.7 on the displayHigh heat only for the next cycle - the high-heat pressure switch failed to close within 75 seconds while transitioning from low to high heatWarning
32.13 short flashes, 2 long flashesOpen main pressure switchWarning
32.2Major code 32 on the LED (3 short, 2 long); 32.2 on the displayOpen main pressure switchWarning
33.13 short flashes, 3 long flashesA switch has opened in the main limit circuit - the limit or flame rollout switch is openSoft lockout
33.2Major code 33 on the LED (3 short, 3 long); 33.2 on the displayLockout to high heat only for the current cycle, following limit circuit tripsWarning
34.13 short flashes, 4 long flashesIgnition fault during four consecutive ignition trials - the furnace tried to light four times without proving flameWarning
34.2Major code 34 on the LED (3 short, 4 long); 34.2 on the displayAfter successful ignitionSafety fault
34.3Major code 34 on the LED (3 short, 4 long); 34.3 on the displayAfter successful ignitionSafety fault
414 short flashes, 1 long flash; minor codes 41.1 and 41.2No blower RPMWarning
45.14 short flashes, 5 long flashes; 45.1 on the displayControl failure - flame circuit fault, memory mismatch, or sequence error on the control boardSoft lockout
45.2Major code 45 on the LED (4 short, 5 long); 45.2 on the displayControl failure - the gas valve relay will not closeSafety fault
45.3Major code 45 on the LED (4 short, 5 long); 45.3 on the displayControl failure - EEPROM memory issue on the control boardSoft lockout
46.14 short flashes, 6 long flashes; 46.1 on the displayMomentary loss of powerStatus
52.1 / 52.25 short flashes, 2 long flashesSupply Air TemperatureWarning

Bryant furnace code 10.1: L1 polarity fault

Hard lockoutShown as: Rapid, continuous flashing with no pause; display reads 10.1

L1 polarity fault. The polarity of the incoming 115 V power is reversed, so the control cannot prove flame and the furnace will not run.

Manual wording: “10.1 L1 POLARITY FAULT Rapid flash LED”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Line voltage hot and neutral reversed at a junction box, outlet or the furnace
  2. On twinned furnaces, incorrect low-voltage (24 V) transformer phasing

When to call a technician

Correcting reversed 115 V polarity means working inside live junction boxes. Call a licensed HVAC technician or electrician.

Sources

Bryant furnace code 12.1: "W" on at power up - normal operation

StatusShown as: 1 short flash, 2 long flashes

"W" on at power up - normal operation. The blower runs for 90 seconds because the furnace was powered up during a call for heat, or the call ended during the blower on-delay.

Manual wording: “12.1 "W" ON at power up - Normal operation. Blower runs for 90 seconds, if unit is powered up during a call for het (R-W closed)”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Power was interrupted and restored while the thermostat was calling for heat
  2. The thermostat call ended during the blower on-delay period

What you can safely check yourself

  • Nothing to fix - this is normal after a power blip or after switching the furnace back on

When to call a technician

If 12.1 appears repeatedly without any power outages, have a technician check for a loose 115 V connection or a failing blower door switch.

Sources

Bryant furnace code 13.1: Limit circuit lockout

Soft lockoutShown as: 1 short flash, 3 long flashes

Limit circuit lockout. The limit, draft safeguard, flame rollout, or blocked-vent switch has been open longer than 3 minutes. The control locks out and auto-resets after 3 hours.

Manual wording: “13.1 LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit, draft safeguard, flame rollout, or blocked vent switch*(if used) is open longer than 3 minutes. Control will auto-reset after 3 hours. See code 33.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Sustained overheating from restricted airflow - see code 33 for the full cause list
  2. Flame rollout switch tripped (requires manual reset by a technician)
  3. Defective limit switch or connections

What you can safely check yourself

  • Check and replace a dirty air filter
  • Make sure supply registers and return grilles are open and not blocked
  • Make sure the furnace blower door is fully closed and latched

When to call a technician

A 3-minute limit trip means the furnace was genuinely overheating or not venting. Have a technician confirm why before running it again - a tripped flame rollout switch in particular must never be reset without finding the cause.

Sources

Bryant furnace code 14.1: Ignition lockout

Soft lockoutShown as: 1 short flash, 4 long flashes

Ignition lockout. The furnace failed to ignite the gas and prove flame in four attempts. The control auto-resets after 3 hours.

Manual wording: “14.1 IGNITION LOCKOUT - System failed to ignite gas and prove flame in 4 attempts. Control will auto-reset after 3 hours. See status code 34.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Incorrect manifold pressure or gas firing rate
  2. Gas inlet pressure fluctuations
  3. Igniter, flame sensor, or gas valve problem - see code 34

What you can safely check yourself

  • Check that other gas appliances in the house still work, confirming gas service is on
  • Turn the furnace off at the service switch for a minute and back on once to allow one clean retry

When to call a technician

Everything on the ignition side - igniter, flame sensor, gas valve, gas pressure - is inside the burner compartment of a live gas appliance. Call a technician rather than opening it.

Sources

Bryant furnace code 14.2: Flame lost - the flame signal dropped out three times after 70 seconds of heating

Safety faultShown as: Major code 14 flashed on the LED (1 short, 4 long); 14.2 on the display

Flame lost - the flame signal dropped out three times after 70 seconds of heating.

Manual wording: “14.2 FLAME LOST - 3 times after 70s of heating”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Incorrect manifold pressure and gas firing rate
  2. Gas inlet pressure fluctuations
  3. Flame sensing problem - see code 34

What you can safely check yourself

  • Check that the air filter is clean and vents are open, since poor airflow can disturb the flame

When to call a technician

Repeated loss of an established flame is a combustion fault. Have a technician verify gas pressure and the flame sensing circuit before the furnace runs again.

Sources

Bryant furnace code 14.3: Lockout after seven loss-of-flame events during a single heat request

Safety faultShown as: Major code 14 flashed on the LED (1 short, 4 long); 14.3 on the display

Lockout after seven loss-of-flame events during a single heat request.

Manual wording: “14.3 LOCKOUT - 7 loss of flame events during a heat request”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Incorrect manifold pressure and gas firing rate
  2. Gas inlet pressure fluctuations
  3. Flame sensing problem - see code 34

What you can safely check yourself

  • Check that the air filter is clean and supply and return vents are open

When to call a technician

Do not keep resetting the furnace to force it to run. Seven flame losses in one call needs a technician to check gas supply and combustion setup.

Sources

Bryant furnace code 15.1: Blower RPM lockout

Soft lockoutShown as: 1 short flash, 5 long flashes

Blower RPM lockout. The control locked out because no blower RPM was detected.

Manual wording: “15.1 BLOWER RPM LOCKOUT - Lockout occurs when no blower rpm is detected.”

Documented for: 926TC

Likely causes, most common first

  1. Loose blower wire connections
  2. Failed blower motor

What you can safely check yourself

  • Make sure the blower access door is fully closed and latched - the door switch cuts power to the blower

When to call a technician

Testing an ECM blower motor and its harness requires a technician with the right meter and the motor's specifications.

Source

Bryant furnace code 19.1: InteliSense communication loss - the furnace control has lost communication with the ecobee for Bryant thermostat

WarningShown as: 1 short flash, 9 long flashes

InteliSense communication loss - the furnace control has lost communication with the ecobee for Bryant thermostat.

Manual wording: “19.1 INTELISENSE COMMUNICATION LOSS - Loss of InteliSense communications with the thermostat.”

Documented for: 926TC

Likely causes, most common first

  1. Loose or broken R and Y wire connections between the control and the thermostat
  2. Thermostat not configured for InteliSense

What you can safely check yourself

  • Check that your thermostat still powers on and responds
  • Check the thermostat's batteries if it uses them

When to call a technician

The thermostat wiring and InteliSense configuration should be checked by the dealer who set the system up.

Source

Bryant furnace code 21.1: 24 VAC was sensed on the gas valve when it should not be there

Hard lockoutShown as: 2 short flashes, 1 long flash

24 VAC was sensed on the gas valve when it should not be there. The control turns off and waits before retrying.

Manual wording: “21.1 24VAC sensed on gas valve when shouldn't be. - Turn off power and wait 5 minutes to retry.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Stuck-closed gas valve relay on the control board
  2. Miswire or short at the gas valve wire

When to call a technician

This code means the board may not be able to keep the gas valve shut. Turn the furnace off at the service switch and call a technician.

Sources

Bryant furnace code 22.1: False flame

Safety faultShown as: 2 short flashes, 2 long flashes

False flame. The control senses flame while the gas valve is de-energized. The inducer runs continuously until the fault clears.

Manual wording: “22.1 FALSE FLAME - Flame is proved while gas valve is de-energized. Inducer will run until fault is cleared.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Stuck open or leaky gas valve

When to call a technician

The furnace is detecting burning gas when the valve should be closed. Shut the furnace off at the service switch and call a technician right away. Do not touch the gas valve.

Sources

Bryant furnace code 23.1: Stuck-closed main pressure switch

WarningShown as: 2 short flashes, 3 long flashes

Stuck-closed main pressure switch. The control expected the main (low-heat) pressure switch to be open before the inducer started, and it was already closed.

Manual wording: “23 1 Stuck closed Main pressure switch”

Documented for: 912SE, 926TC

Likely causes, most common first

  1. Obstructed pressure tube
  2. Pressure switch stuck closed

When to call a technician

The pressure switch is a combustion safety device. A technician has to inspect the tube and switch. Never jumper or bypass a pressure switch.

Sources

Bryant furnace code 23.2: Stuck-closed secondary

WarningShown as: Major code 23 flashed on the LED (2 short, 3 long); 23.2 on the display

Stuck-closed secondary (high-heat) pressure switch. On the 926TC label this is listed as the HPS pressure switch.

Manual wording: “23 2 Stuck closed secondary pressure switch”

Documented for: 912SE, 926TC

Likely causes, most common first

  1. Obstructed pressure tube
  2. Pressure switch stuck closed

When to call a technician

Pressure switch faults must be diagnosed by a technician. Do not bypass the switch to get heat.

Sources

Bryant furnace code 23.4: Low-heat

WarningShown as: Major code 23 flashed on the LED (2 short, 3 long); 23.4 on the display

Low-heat (LPS) pressure switch fault - the switch did not open when expected.

Manual wording: “23.4 LPS pressure switch”

Documented for: 926TC

Likely causes, most common first

  1. Obstructed pressure tube
  2. Pressure switch stuck closed

When to call a technician

Have a technician inspect the pressure tubing and switch; never jumper a pressure switch.

Source

Bryant furnace code 24.1: Fuse fault - the 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiring

Hard lockoutShown as: 2 short flashes, 4 long flashes

Fuse fault - the 24 V secondary voltage fuse on the control board is open, which means there is a short in the low-voltage wiring.

Manual wording: “24.1 FUSE FAULT”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Short circuit in the secondary voltage (24 V) wiring, including the thermostat leads

When to call a technician

Simply replacing the fuse blows it again. A technician needs to isolate the shorted thermostat or accessory wire first.

Sources

Bryant furnace code 25.1: No program information in the control's microprocessor - the furnace will not heat

Hard lockoutShown as: 2 short flashes, 5 long flashes

No program information in the control's microprocessor - the furnace will not heat.

Manual wording: “25.1 NO PROGRAM info in micro, no heating operation.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Control board was never programmed, or the program was lost

When to call a technician

The control has to be reprogrammed with the correct program number from the rating plate using the Bryant service app or a super plug. That is dealer-only work.

Sources

Bryant furnace code 25.2: Corrupted program file

Hard lockoutShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.2 on the display

Corrupted program file. The control must be reprogrammed with the service app or a super plug; there is no heating operation until it is.

Manual wording: “25.2 CORRUPTED PROGRAM FILE, reprogram control using service app or super plug (supplied separately), no heating operation.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Corrupted program in the control board

When to call a technician

Reprogramming the control requires the dealer's service app or a super plug. Call your Bryant dealer.

Sources

Bryant furnace code 25.3: Twinned units are not identical - the two furnaces' program numbers do not match, so the main unit will not operate

Hard lockoutShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.3 on the display

Twinned units are not identical - the two furnaces' program numbers do not match, so the main unit will not operate.

Manual wording: “25.3 TWINNED UNITS ARE NOT IDENTICAL, program #'s do not match. Ensure furnaces are identical (same program #) when twinning. Main unit will not operate.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Two twinned furnaces programmed with different program numbers

When to call a technician

Twinned furnaces have to be reprogrammed to matching program numbers by the installing dealer.

Sources

Bryant furnace code 25.4: Main program invalid - the control is running on its backup program

WarningShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.4 on the display

Main program invalid - the control is running on its backup program. The furnace still operates normally, but the control should be reprogrammed.

Manual wording: “25.4 MAIN PROGRAM INVALID , using backup program to operate. Reprogram control to correct issue. Control still operates normally.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Main program in the control became invalid

What you can safely check yourself

  • Nothing urgent - the furnace still runs, but mention this code the next time a technician visits

When to call a technician

Have the dealer reprogram the control at the next service visit.

Sources

Bryant furnace code 25.5: Installer settings corrupted

WarningShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.5 on the display

Installer settings corrupted. The control keeps running on default installer settings until the settings are reselected or the control is reprogrammed.

Manual wording: “25.5 INSTALLER SETTINGS CORRUPTED. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Stored installer settings became corrupted

What you can safely check yourself

  • The furnace still runs on defaults - note the code for your technician

When to call a technician

The installer's airflow and delay settings need to be reselected by a dealer so the furnace matches your ductwork again.

Sources

Bryant furnace code 25.6: Wrong program for the control being used - there is no heating operation until the control is reprogrammed to match

Hard lockoutShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.6 on the display

Wrong program for the control being used - there is no heating operation until the control is reprogrammed to match.

Manual wording: “25.6 WRONG PROGRAM for control used - reprogram control so program matches control used. No heating operation.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Control programmed with a program that does not match the board installed

When to call a technician

The dealer needs to reprogram the control so the program matches the board and the furnace's rating plate.

Sources

Bryant furnace code 25.7: A non-condensing program was detected in a condensing model furnace

Hard lockoutShown as: Major code 25 flashed on the LED (2 short, 5 long); 25.7 on the display

A non-condensing program was detected in a condensing model furnace.

Manual wording: “25.7 NON-CONDENSING PROGRAM detected in a condensing model.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Wrong program loaded into the control after a board replacement

When to call a technician

The control needs the correct program number from the rating plate loaded by a dealer.

Sources

Bryant furnace code 27: The program in the super plug is missing, not recognized, or corrupted

Hard lockoutShown as: 2 short flashes, 7 long flashes; minor codes 27.1, 27.2 and 27.3

The program in the super plug is missing, not recognized, or corrupted.

Manual wording: “27.1 27.2 27.3 Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Super plug missing, unreadable, or corrupted

When to call a technician

The technician needs to remove the super plug and retry, then try a different super plug; if the code persists the control is replaced.

Sources

Bryant furnace code 31.2: Open secondary pressure switch

WarningShown as: 3 short flashes, 1 long flash; 31.2 on the display

Open secondary pressure switch (HPS) - the high-heat pressure switch did not close, or reopened, when the control needed it.

Manual wording: “31 2 Open secondary pressure switch (HPS)”

Documented for: 912SE

Likely causes, most common first

  1. Restricted vent or blocked intake/exhaust termination
  2. Plugged condensate drain
  3. Excessive wind at the vent
  4. Disconnected or obstructed pressure tubing
  5. Defective inducer motor or low inducer voltage
  6. Defective pressure switch

What you can safely check yourself

  • Go outside and check the furnace intake and exhaust pipes for snow, ice, leaves, or a nest and clear any blockage
  • Check the condensate drain line and trap for a clog
  • Replace a dirty air filter

When to call a technician

If the vents are clear and the drain is open, the inducer, pressure switch, or tubing needs a technician. Never jumper a pressure switch.

Source

Bryant furnace code 31.3: Secondary pressure switch lockout - the secondary

Soft lockoutShown as: Major code 31 on the LED (3 short, 1 long); 31.3 on the display

Secondary pressure switch lockout - the secondary (high-heat) pressure switch failed to close after three trials.

Manual wording: “31 3 Secondary PS Lockout - failed to close secondary PS after three trials”

Documented for: 912SE

Likely causes, most common first

  1. Restricted or improperly sized vent
  2. Plugged condensate drain
  3. Obstructed or disconnected pressure tubing
  4. Failed inducer motor or pressure switch

What you can safely check yourself

  • Check outdoor vent terminations for snow, ice or debris
  • Check the condensate drain and trap for a clog

When to call a technician

Three failed attempts to make the pressure switch means the venting or the inducer needs a technician's inspection.

Source

Bryant furnace code 31.6: Open secondary pressure switch - the high-heat pressure switch did not close for one minute after the gas valve closed, or it has reopened

WarningShown as: Major code 31 on the LED (3 short, 1 long); 31.6 on the display

Open secondary pressure switch - the high-heat pressure switch did not close for one minute after the gas valve closed, or it has reopened.

Manual wording: “31.6 OPEN SECONDARY PRESSURE SWITCH - HPS did not close for one minute after gas valve closed or has reopened.”

Documented for: 926TC

Likely causes, most common first

  1. Failed to close secondary pressure switch after three trials
  2. Excessive wind
  3. Restricted vent
  4. Defective inducer motor
  5. Low inlet gas pressure (if LGPS used)
  6. Inadequate combustion air supply
  7. Improper vent sizing
  8. Disconnected or obstructed pressure tubing
  9. Condensate drainage restricted or blocked

What you can safely check yourself

  • Check the outdoor intake and exhaust pipes for blockage from snow, ice, leaves, or nests
  • Check the condensate drain line and trap for a clog

When to call a technician

Vent sizing, inducer performance, and pressure switch calibration are technician diagnostics.

Source

Bryant furnace code 31.7: High heat only for the next cycle - the high-heat pressure switch failed to close within 75 seconds while transitioning from low to high heat

WarningShown as: Major code 31 on the LED (3 short, 1 long); 31.7 on the display

High heat only for the next cycle - the high-heat pressure switch failed to close within 75 seconds while transitioning from low to high heat.

Manual wording: “31.7 HIGH HEAT ONLY for next cycle- HPS failed to close in 75s when transitioning from low to high heat.”

Documented for: 926TC

Likely causes, most common first

  1. Same venting and pressure switch causes as code 31.6

What you can safely check yourself

  • Check outdoor vent terminations for blockage
  • Check the condensate drain for a clog

When to call a technician

If the furnace keeps forcing itself to high heat, have a technician check the high-heat pressure switch and venting.

Source

Bryant furnace code 32.1: Open main pressure switch

WarningShown as: 3 short flashes, 2 long flashes

Open main pressure switch (LPS) - the main low-heat pressure switch is open when it should be closed.

Manual wording: “32 1 Open Main pressure switch (LPS)”

Documented for: 912SE

Likely causes, most common first

  1. Restricted vent or blocked intake/exhaust termination
  2. Plugged condensate drain
  3. Disconnected or obstructed pressure tubing
  4. Defective inducer motor
  5. Defective pressure switch
  6. Excessive wind

What you can safely check yourself

  • Check outdoor intake and exhaust pipes for snow, ice, leaves, or a nest
  • Check the condensate drain line and trap for a clog
  • Replace a dirty filter

When to call a technician

If venting and drain are clear, the inducer or pressure switch needs testing by a technician.

Source

Bryant furnace code 32.2: Open main pressure switch

WarningShown as: Major code 32 on the LED (3 short, 2 long); 32.2 on the display

Open main pressure switch. If the low-heat pressure switch stays open longer than 5 minutes or reopens, the inducer shuts off for 15 minutes before retrying. On a two-stage furnace this can force the next cycle to high heat only.

Manual wording: “32.2 OPEN MAIN PRESSURE SWITCH - If LPS is open longer than 5 minutes or has reopened, inducer shuts off for 15 minutes before retry.”

Documented for: 926TC

Likely causes, most common first

  1. Restricted or improperly sized vent
  2. Plugged condensate drain
  3. Obstructed pressure tubing
  4. Defective inducer motor or pressure switch
  5. Excessive wind

What you can safely check yourself

  • Check outdoor vent terminations for snow, ice, or debris
  • Check the condensate drain and trap for a clog
  • Replace a dirty air filter

When to call a technician

Have a technician confirm vent sizing and pressure switch operation. Do not bypass the switch.

Source

Bryant furnace code 33.1: A switch has opened in the main limit circuit - the limit or flame rollout switch is open

Soft lockoutShown as: 3 short flashes, 3 long flashes

A switch has opened in the main limit circuit - the limit or flame rollout switch is open. The blower runs 4 minutes or until the switch remakes. If the switch stays open longer than 3 minutes the code becomes lockout 13.

Manual wording: “33.1 A SWITCH HAS OPENED IN THE MAIN LIMIT - Indicates the limit or flame rollout is open. Blower will run for 4 minutes or until open switch remakes whichever is longer.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Dirty filter or restricted duct system
  2. Loose blower wheel
  3. Defective switch or connections
  4. Defective blower motor
  5. Improper gas input adjustment

What you can safely check yourself

  • Check and replace the air filter - a clogged filter is by far the most common cause
  • Make sure supply registers and return air grilles are open and unblocked
  • Make sure the furnace door is fully seated

When to call a technician

If the code returns after a filter change, the limit or rollout switch is tripping for a reason a technician must find. The flame rollout switch requires manual reset and must never be reset without diagnosing why it tripped.

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Bryant furnace code 33.2: Lockout to high heat only for the current cycle, following limit circuit trips

WarningShown as: Major code 33 on the LED (3 short, 3 long); 33.2 on the display

Lockout to high heat only for the current cycle, following limit circuit trips.

Manual wording: “33.2 LOCKOUT - High Heat Only for current cycle.”

Documented for: 926TC

Likely causes, most common first

  1. Dirty filter or restricted duct system
  2. Loose blower wheel
  3. Defective switch or connections
  4. Defective blower motor
  5. Improper gas input adjustment

What you can safely check yourself

  • Replace the air filter
  • Open any closed supply registers and clear blocked return grilles

When to call a technician

Repeated limit trips need a technician to check airflow, blower performance, and gas input rate.

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Bryant furnace code 34.1: Ignition fault during four consecutive ignition trials - the furnace tried to light four times without proving flame

WarningShown as: 3 short flashes, 4 long flashes

Ignition fault during four consecutive ignition trials - the furnace tried to light four times without proving flame.

Manual wording: “34.1 IGNITION FAULT - during four consecutive ignition trials.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Gas valve turned off or manual shut-off valve closed
  2. Green/yellow ground wire not connected to the furnace sheet metal
  3. Flame sensor grounded or dirty
  4. Defective hot surface igniter
  5. Low inlet gas pressure

What you can safely check yourself

  • Check that other gas appliances still work, confirming gas service is on
  • Make sure the furnace door is fully closed and latched

When to call a technician

Checking the igniter, flame sense current, and gas valve requires opening a live gas appliance. Call a technician instead of attempting it.

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Bryant furnace code 34.2: After successful ignition

Safety faultShown as: Major code 34 on the LED (3 short, 4 long); 34.2 on the display

After successful ignition (flame proven), flame was lost before the heating blower on-delay finished.

Manual wording: “34.2 AFTER SUCESSFUL IGNITION flame loss before heating blower on delay”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Oxide buildup on the flame sensor
  2. Low inlet gas pressure
  3. Poor control ground continuity
  4. Inadequate flame carryover or rough ignition

What you can safely check yourself

  • Confirm other gas appliances in the house are working normally

When to call a technician

Flame loss right after ignition is a combustion and flame-sensing problem for a technician; do not attempt to clean or reposition the flame sensor yourself.

Sources

Bryant furnace code 34.3: After successful ignition

Safety faultShown as: Major code 34 on the LED (3 short, 4 long); 34.3 on the display

After successful ignition (flame proven), flame was lost after the heating blower on-delay.

Manual wording: “34.3 AFTER SUCCESSFUL IGNITION flame loss after heating blower on delay”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Oxide buildup on the flame sensor
  2. Low inlet gas pressure
  3. Poor control ground continuity
  4. Airflow disturbing the flame

What you can safely check yourself

  • Check that the air filter is clean and supply/return vents are open

When to call a technician

Losing flame once the blower comes on often points at gas pressure or flame sensing. Have a technician measure flame current and manifold pressure.

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Bryant furnace code 41: No blower RPM

WarningShown as: 4 short flashes, 1 long flash; minor codes 41.1 and 41.2

No blower RPM. 41.1 means no blower RPM at start-up; 41.2 means no blower RPM after the motor was already running.

Manual wording: “41.1 NO BLOWER RPM - No blower rpm at startup 41.2 NO BLOWER RPM - No blower rpm when blower motor is running.”

Documented for: 926TC

Likely causes, most common first

  1. Loose blower wire connections
  2. Failed blower motor

What you can safely check yourself

  • Make sure the blower access door is fully closed and latched
  • Turn the furnace off at the service switch for a minute and back on once

When to call a technician

An ECM blower motor and its wiring have to be tested by a technician.

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Bryant furnace code 45.1: Control failure - flame circuit fault, memory mismatch, or sequence error on the control board

Soft lockoutShown as: 4 short flashes, 5 long flashes; 45.1 on the display

Control failure - flame circuit fault, memory mismatch, or sequence error on the control board.

Manual wording: “45.1 CONTROL FAILURE - flame circuit fault, memory mismatch or sequence error.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Internal control board failure

What you can safely check yourself

  • Turn the furnace off at the service switch for a minute and back on once - the label says to cycle power

When to call a technician

Bryant's own instruction is that if code 45 repeats after cycling power, the control must be replaced.

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Bryant furnace code 45.2: Control failure - the gas valve relay will not close

Safety faultShown as: Major code 45 on the LED (4 short, 5 long); 45.2 on the display

Control failure - the gas valve relay will not close.

Manual wording: “45.2 CONTROL FAILURE - gas valve relay will not close.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Failed gas valve relay on the control board

What you can safely check yourself

  • Turn the furnace off at the service switch and leave it off until a technician arrives

When to call a technician

A gas valve relay that will not close means the board cannot reliably shut off gas. Shut the furnace down and call a technician; the fix is a new control.

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Bryant furnace code 45.3: Control failure - EEPROM memory issue on the control board

Soft lockoutShown as: Major code 45 on the LED (4 short, 5 long); 45.3 on the display

Control failure - EEPROM memory issue on the control board.

Manual wording: “45.3 CONTROL FAILURE - EEPROM memory issue.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Corrupted or failed memory on the control board

What you can safely check yourself

  • Turn the furnace off at the service switch for a minute and back on once

When to call a technician

If the code repeats after a power cycle, the control board has to be replaced by a technician.

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Bryant furnace code 46.1: Momentary loss of power

StatusShown as: 4 short flashes, 6 long flashes; 46.1 on the display

Momentary loss of power. Heating stops and restarts on its own once the power fluctuation is resolved.

Manual wording: “46.1 MOMENTARY LOSS of power - Heating operation will stop and will restart once the power fluctuation is resolved.”

Documented for: 926TC, 912SE

Likely causes, most common first

  1. Brownout or brief power interruption to the furnace

What you can safely check yourself

  • Nothing to fix if you had a power blip
  • If it repeats without outages, check that the breaker is fully on and the furnace switch is not loose

When to call a technician

Frequent 46.1 codes with no utility outages usually mean a loose 115 V connection or failing door switch - have a technician look.

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Bryant furnace 52.1 / 52.2: Supply Air Temperature

WarningShown as: 5 short flashes, 2 long flashes

Supply Air Temperature (SAT) sensor fault. 52.1 means the SAT sensor connection is open; 52.2 means the SAT sensor wires are shorted.

Manual wording: “52.1 SAT OPEN - Supply Air Temperature sensor connection is open 52.2 SAT SHORT - Supply Air Temperature sensor wires are shorted”

Documented for: 926TC

Likely causes, most common first

  1. Loose connection at the control board screw terminals
  2. Cut or shorted wires to the SAT sensor
  3. Damaged SAT sensor

When to call a technician

The sensor wiring lands on the control board inside the furnace cabinet - have a technician check the connection and sensor.

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How old is this Bryant?

Age changes what a fault code means for you. The same failure is a routine repair on a six-year-old unit and the end of the line on a twenty-year-old one. Your Bryant serial number has the build date in it.

Decode your Bryantserial number →

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