HVAC Code Lookup

Bryant Furnace: 1 Flashes

A Bryant furnace LED pattern starting with 1 flashes matches 8 documented codes: 10.1, 12.1, 13.1, 14.1, 14.2, 14.3, 15.1, 19.1. Watch the full pattern (short vs. long flashes) to tell them apart — all 8 are explained below.

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 10.1

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 12.1

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 13.1

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 14.1

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 14.2

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Full page for Bryant code 14.3

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Source

Full page for Bryant code 15.1

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.

A Bryant furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Source

Full page for Bryant code 19.1

Other Bryant codes