Carrier Code 37
No Flame Detected
What Carrier Code 37 Means
No Flame Detected – Ignitor glows but no flame appears
Common Causes
- Gas valve not opening
- Insufficient gas pressure
- Burner ports clogged
- Ignitor positioned incorrectly
- Safety valve defective
First-Check: Step-by-Step Troubleshooting
- Verify gas odor near burner
- Check gas pressure at meter (normal 3.5-7 inches)
- Inspect burner holes for clogs
- Check ignitor position over burner
- Listen for gas valve click
- Replace gas valve if no click sound
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