E12
Kospel
Flue Gas Temperature Sensor Fault
Furnace shows E12; burner does not start and fan may run briefly.
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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
Defective flue gas NTC sensor, Damaged sensor wiring, Sensor overheated due to blocked flue, Loose connector at PCB
How to Fix / Troubleshooting
Safety: Isolate power and allow the flue to cool before touching the sensor or flue components.
- Locate flue gas sensor: It is typically mounted on the flue collector or near the combustion chamber outlet.
- Inspect sensor and cable: Look for discoloration, cracking, or melted insulation indicating overheating. Check that the cable is intact and the connector is firmly seated.
- Check flue for blockage: Ensure the flue path is clear and the terminal is not obstructed. A blocked flue can overheat the sensor.
- Replace sensor if faulty: Install a genuine Kospel flue gas NTC sensor if the original is damaged or tests out of range.
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Repair Difficulty
Medium
3/5
Required Part
Flue Gas Temperature Sensor
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