HVAC Code Lookup

Bryant Furnace: 2 Flashes

A Bryant furnace LED pattern starting with 2 flashes matches 14 documented codes: 21.1, 22.1, 23.1, 23.2, 23.4, 24.1, 25.1, 25.2, 25.3, 25.4, 25.5, 25.6, 25.7, 27. Watch the full pattern (short vs. long flashes) to tell them apart — all 14 are explained below.

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.

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 21.1

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.

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 22.1

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.

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 23.1

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.

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 23.2

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.

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 23.4

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.

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 24.1

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.

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 25.1

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.

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 25.2

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.

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 25.3

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.

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 25.4

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.

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 25.5

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.

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 25.6

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.

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 25.7

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.

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 27

Other Bryant codes