E7
Pennco
Flame Detected with No Call for Heat
Boiler shows E7 and shuts down, fan may continue to run
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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, Stuck gas valve leaking gas, Faulty integrated control board misreading flame signal
How to Fix / Troubleshooting
Critical safety warning: This fault can indicate a gas valve that is not closing fully. Turn off gas supply to the boiler immediately and do not attempt to operate it until inspected.
- Shut off gas: Close the manual gas shutoff valve upstream of the Pennco boiler.
- Inspect flame sensor wiring: With power off, check the flame sensor lead for damage, melted insulation, or contact with metal surfaces that could cause a false flame signal.
- Check control board: Look for signs of moisture or corrosion on the integrated control board, especially around the flame sense terminal.
- Do not attempt to repair gas valve: If there is any suspicion that the gas valve is leaking or stuck, it must be replaced by a licensed gas technician.
- Have a professional test: A technician should measure microamp flame signal and verify the gas valve closes fully when power is removed.
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Repair Difficulty
Professional Required
5/5
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