F2
Peerless
False Flame Detection
Boiler shows F2 and shuts down; may be labeled 'Flame Detected with No Call'
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Shorted flame sensor to ground, moisture on burner, faulty control board flame circuit
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Allow the boiler to cool.
Steps:
- Inspect flame sensor wiring: Look for damaged insulation or wires touching metal surfaces.
- Check for moisture: Inspect the burner and flame rod area for condensation or water leaks from above. Repair any leaks.
- Clean flame rod: Remove and clean the flame sensor. Ensure the ceramic insulator is not cracked.
- Dry out cabinet: If moisture is present, dry the area thoroughly before restoring power.
- If F2 persists: The control board flame detection circuit may be faulty and require replacement by a technician.
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Repair Difficulty
Hard
4/5
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