4-FLASHCRITICAL
Flame Sensed Without Call for Heat
The flame sensor detects a flame when the gas valve should be closed, indicating a stuck valve or sensor issue.
What This Error Code Means
Flame is present when it shouldn't be, suggesting a gas valve leak or sensor contamination.
Common Causes
- Gas valve leaking internally
- Flame sensor shorted
- Control board failure
- Stuck gas valve
- Flame sensor picking up stray light
Affected Brands
LennoxCarrierTraneGoodmanRheemYorkBryant
How ROMA Heating Fixes This
- Verify gas valve closes fully
- Test flame sensor isolation
- Check control board operation
- Replace gas valve if leaking
- Inspect burner assembly for cross-lighting
24/7 Emergency Service
Available nights, weekends, and holidays. Fast 1-2 hour response.
Licensed Technicians
TSBC Gas License LGA0202903. Fully insured and WCB covered.
Same-Day Service
We diagnose and fix error code issues quickly.
Related Services
Seeing Error Code 4-FLASH?
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