LED flashes code 22; furnace may not start inducer or may behave erratically.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Danger: This code can indicate a gas valve leaking or flame present when it should not be. If you smell gas, shut off gas at the manual shutoff and call a professional immediately.
Steps:
- Turn off power and gas: Use the service switch and manual gas shutoff.
- Inspect flame sensor: Remove the flame sensor and check for damage or insulation breakdown. Ensure the ceramic insulator is intact and the rod is not touching metal when installed.
- Check wiring: Inspect the flame sensor wire from the sensor to the control board for cuts, melted insulation, or pinched spots against the burner box.
- Verify burner ground: Ensure the burner assembly and control board ground wire are securely fastened to clean metal.
- Restore power (gas still off): Turn power on with gas off and call for heat. If the board still senses flame (code 22) with no gas, the control board is likely faulty.
When to call a technician: Immediately if there is any suspicion of a leaking gas valve or if code 22 persists after sensor and wiring checks. Gas valve and board diagnostics require professional tools.