Flame Detected with No Call
Weil-McLain
False Flame Detection
Control indicates 'Flame Detected' or similar even though there is no call for heat and burner is off.
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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 flame rod, defective control board flame amplifier, stray voltage on burner ground
How to Fix / Troubleshooting
Safety first: Turn off power before touching any wiring or control components.
- 1. Inspect flame sensor wiring: Check the flame sensor lead for damaged insulation or contact with metal surfaces. Reroute or replace if chafed.
- 2. Clean and dry sensor: Remove the flame sensor, wipe it dry, and clean light oxidation. Moisture or condensate can cause false readings.
- 3. Check for water leaks: Look for condensate dripping onto the burner or sensor area from the condensate trap, vent, or boiler piping. Correct any leaks and ensure proper condensate drainage.
- 4. Reset control: Restore power and reset the boiler. If the control still indicates flame with no burner operation, the integrated control module may be defective.
Professional help: Replacement of the control board or investigation of stray voltage issues should be done by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Integrated Boiler Control Module
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