Payne PG8MAA Error Code 22: Abnormal Flame-Proving Signal
What Does Code 22 Mean?
Status code 22 on the Payne PG8MAA indicates that the flame-proving signal is being detected while the gas valve is de-energized (turned off). This means the control board senses a flame when no flame should be present, which is a serious safety concern.
The most likely cause is a gas valve that is leaking or stuck in the open position. When the gas valve fails to close completely, gas continues to flow to the burners and can ignite from residual heat. The control board detects this through the flame sensor and responds by running the inducer motor continuously to vent any combustion gases until the fault clears.
Turn off the gas supply to the furnace immediately using the manual shutoff valve (turn the handle perpendicular to the pipe). Do not attempt to operate the furnace or diagnose this issue yourself. A qualified HVAC technician must inspect the gas valve to determine if it is leaking or stuck open, and replace it if necessary.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Leaky gas valve allowing gas to flow when closed | Most common | ✗ Call a pro → |
| Gas valve stuck in the open position | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- This code requires immediate professional attention — turn off the gas supply right away
- You smell gas near the furnace
- The inducer motor is running continuously without a normal heating cycle
Sources
✓ Verified against manufacturer service manual — March 2026