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HIGH URGENCY

Carrier Code 22 — Abnormal Flame Proving Signal

Code 22 (2 short + 2 long flashes)

Flame detected when gas valve is supposed to be closed — leaky valve.

Brand: Carrier (Also covers Bryant, Payne)  |  Equipment: Gas Furnace

SAFETY: Code 22 indicates an uncontrolled gas/flame situation. A leaking gas valve is a serious fire and carbon monoxide risk. Shut off the gas supply and call a professional immediately.

What This Code Means

Code 22 on a Carrier furnace means the flame sensor is detecting flame even when the gas valve is de-energized (closed). This usually points to a gas valve that is leaking or stuck open.

Likely Causes (Ranked)

Most common

Leaky gas valve

What: Gas valve doesn't fully close, allowing fuel to keep burning.

How to check: Tech tests valve operation; visible flame after call for heat ends.

Fix: Replace gas valve — do not delay, fire/CO risk.

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Common

Stuck-open gas valve

What: Mechanical sticking holds valve in open position.

How to check: Tech diagnostic with manometer.

Fix: Replace gas valve.

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Less common

Faulty control board

What: Board falsely reports flame signal even when sensor sees no flame.

How to check: Test flame sensor signal at the board with meter.

Fix: Replace control board.

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Diagnostic Steps

  1. Shut off gas at the furnace valve immediately
  2. Cut power to the furnace
  3. Call a licensed HVAC technician
  4. Do not attempt to operate until inspected

Frequently Asked Questions

Is Carrier code 22 dangerous?
Yes — it indicates uncontrolled flame. Shut off the gas supply at the furnace and call a licensed HVAC technician immediately.
Can I fix code 22 myself?
No. Gas valve replacement requires proper tools, training, and gas pressure testing. This is a professional repair.
How urgent is code 22?
Very urgent — same-day service recommended. The risk of fire and CO exposure is real.

Related Carrier Codes

Carrier Error Code 21Carrier Error Code 34

Related Symptoms

Furnace Smells GasFurnace Pilot Yellow Flame

Need More Help?

Try our interactive symptom diagnostic tool or browse Carrier parts.

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