Bryant 315AAV Error Code 22: Abnormal Flame-Proving Signal
What Does Code 22 Mean?
Status code 22 on the Bryant 315AAV is an abnormal flame-proving signal fault. The integrated furnace control has detected that the flame sensor is proving a flame while the gas valve is de-energized and should be closed. When this fault is active, the inducer motor continues running to ventilate the heat exchanger until the fault is cleared.
The service documentation identifies two causes: a leaky or stuck-open gas valve, and a faulty flame sensor giving false readings. A leaky valve allows a small amount of gas to pass through and sustain a residual flame even when the valve is commanded closed. A stuck-open valve means the mechanical actuator cannot close, allowing full gas flow when none should occur. A faulty flame sensor can generate a flame signal without an actual flame present.
Because this fault involves potential gas flow when the valve should be closed, it is a safety-relevant condition. A licensed HVAC technician must inspect the gas valve and flame sensor circuit to determine which component is at fault before the furnace is returned to service.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Leaky or stuck-open gas valve | Most common | ✗ Call a pro → |
| Faulty flame sensor giving false readings | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Contact a technician immediately — a leaky or stuck-open gas valve is a safety hazard that must be inspected before operating the furnace
- Do not attempt to operate the furnace until code 22 is diagnosed and resolved
✓ Verified against manufacturer service manual — March 2026