Bryant 355MAV Error Code 22: Abnormal Flame-Proving Signal
What Does Code 22 Mean?
Status code 22 on the Bryant 355MAV means the control board is proving flame while the gas valve is de-energized (closed). The inducer motor will run continuously until the fault clears as a safety measure to ventilate any gas that may be present in the heat exchanger and burner area.
This is a serious safety concern because it suggests gas may be reaching the burners when it should not be. The most common cause is a gas valve that is leaking internally, allowing small amounts of gas to pass through even when the valve is electrically closed. A stuck-open gas valve is another possibility — the valve's internal mechanism may have failed in the open position due to wear, debris, or a mechanical defect.
In rare cases, this code can also be triggered by a wiring fault in the flame sensor circuit that sends a false signal. However, because a leaking gas valve is a possibility, this code should always be treated as an urgent safety issue. Do not attempt to diagnose or repair this yourself. Turn off the gas supply at the manual shutoff valve and call a qualified HVAC technician immediately.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Leaky gas valve | Most common | ✗ Call a pro → |
| Stuck-open gas valve | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Immediately — this code may indicate a leaking or stuck-open gas valve, which is a serious safety hazard
- The inducer motor is running continuously as the control tries to ventilate potential gas
✓ Verified against manufacturer service manual — March 2026