Pennco
Flame Proving / Flame Sensor Issue
Boiler ignites but shuts off within a few seconds repeatedly
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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
Dirty flame sensor, Poor burner ground, Incorrect flame sensor position, Weak flame due to low gas pressure
How to Fix / Troubleshooting
Safety first: Turn off power and gas before removing burner components.
- Clean flame sensor: Remove the flame sensor rod and gently clean it with fine steel wool. Reinstall ensuring it is in the flame path.
- Check grounding: Confirm burner and control ground wires are tight and on clean metal.
- Observe flame: After reassembly, watch the flame through the sight glass. It should fully engulf the sensor.
- If problem persists: Gas pressure and combustion should be checked by a technician.
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Repair Difficulty
Hard
4/5
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