Carrier Error Code 22: Abnormal Flame
LED Blink Pattern
2 short blinks, 2 long blinks.
How to Fix Carrier Code 22
- Step 1: Shut off the unit immediately at the breaker.
- Step 2: If you smell gas, evacuate your home and call the gas company from a safe location.
- Step 3: Contact a qualified HVAC technician to inspect and repair the system.
How to Reset Carrier Code 22
- Turn off the furnace power switch, usually located on or near the unit.
- Turn off the circuit breaker for the furnace. Wait 30 seconds.
- Restore power at the breaker and flip the furnace switch back on.
- Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Carrier Error Code 22 Mean?
The Carrier 22 error code, often displayed as a blinking LED pattern on your furnace or HVAC system, signals that the system has detected an abnormal flame during operation. This could mean the flame is unstable, weak, or present when it shouldn't be. This is a serious issue because it could indicate a problem with gas combustion, potentially leading to a gas leak or carbon monoxide buildup. When this error occurs, the system typically shuts down as a safety precaution. Do not attempt to restart the system until the problem has been diagnosed and repaired by a qualified HVAC technician. Ignoring this error could lead to dangerous conditions in your home.
Common Causes
- Dirty or faulty flame sensor
- Gas valve malfunction
- Combustion air blockage
- Cracked heat exchanger
- Incorrect gas pressure
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Flame present when gas valve is off | Measure voltage at gas valve when it should be closed | 0 VAC. Any voltage indicates a faulty gas valve or control board. |
| Flame signal is erratic or weak | Measure flame sensor microamps (uA) during burner operation | Typically 2-10 uA DC. Low or fluctuating readings indicate a dirty or failing sensor. |
| Combustion air suspected | Inspect the intake and exhaust vents for obstructions | Vents should be clear of debris and properly sized per manufacturer specifications. |
Applicable Carrier Models
- 24ABC6 Air Conditioner(electric)
- 25HBC5 Heat Pump(electric)
- Base Series(gas)
- Base Series Furnace(gas)
- Comfort 80 Gas Furnace(gas)
- Comfort Series(electric)
- Comfort Series Furnace(gas)
- Comfort Series Heat Pump(electric)
- Infinity 20 Heat Pump with Greenspeed Intelligence(electric)
- Infinity 80(gas)
- Infinity Series(electric)
- Infinity Series Furnace(gas)
- Infinity Series Heat Pump(electric)
- Performance Boost 95 Furnace(gas)
- Performance Boost Furnace(gas)
- Performance Series(gas)
- Performance Series Furnace(gas)
- Performance Series Heat Pump(electric)
- WeatherMaker 8000(gas)
- WeatherMaker 9300(gas)
- WeatherMaker Furnace(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Flame Sensor | KH42LZ010 | — | Find Part |
| Gas Valve | EF32CW175 | — | Find Part |
| Ignition Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Carrier model families as 22.
| Code | Description | Severity |
|---|---|---|
| 11 | No Previous Error | Info |
| 12 | Blower On After Power Up | Warning |
| 13 | Limit/Rollout Fault | Critical |
| 14 | Ignition Lockout | Critical |
| 21 | Gas Heating Lockout | Critical |
| 23 | Pressure Switch Fault | Warning |
| 31 | High Stage Pressure Fault | Warning |
| 32 | Low Flame Sense | Warning |
| 33 | Limit/Rollout Switch Lockout | Critical |
| 34 | Ignition/Flame Sense Fault | Warning |