E12
Weishaupt Flue gas overtemperature or sensor failure

Display shows flue gas temperature fault, burner shuts down

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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

Blocked flue or heat exchanger, Failed flue gas temperature sensor, Incorrect sensor placement, Wiring fault to flue sensor

How to Fix / Troubleshooting

Safety: Hot flue components can cause burns. Allow the system to cool and shut off power before inspection.

Steps:

  • Check flue path: Inspect the visible sections of the flue for blockage, sagging, or water accumulation. Ensure terminal is clear.
  • Inspect flue sensor: Locate the flue gas temperature sensor on the flue pipe. Confirm it is firmly attached and not hanging loose. Check cable integrity.
  • Reset and monitor: After cooling, reset the controller and observe operation. If the error reappears quickly, the sensor may be defective or there is a real overheating issue.

Flue gas issues affect safety and efficiency; a Weishaupt technician should verify draft, heat exchanger cleanliness, and sensor calibration.

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Repair Difficulty

Hard 4/5

Required Part

Flue Gas Temperature Sensor
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