E07
Weishaupt
Flue Gas Temperature Sensor Fault
Unit displays E07 and will not operate; may occur immediately on power-up.
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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, Broken sensor wiring, Overheated flue due to blockage, Control board sensor circuit fault
How to Fix / Troubleshooting
Safety: Turn off power and allow the flue and heat exchanger to cool. Do not run the heater with a suspected flue blockage.
- Inspect flue gas sensor: Locate the flue gas temperature sensor on the flue collector or outlet of the Weishaupt heat exchanger. Check that it is firmly attached and not physically damaged.
- Check wiring: Follow the sensor cable back to the control board, looking for chafing, burns, or loose connectors. Reseat the plug.
- Measure sensor: Disconnect the sensor and measure its resistance. Compare to the Weishaupt NTC chart. Replace if out of specification.
- Check for flue blockage: Inspect the flue system for obstructions or severe corrosion that could cause excessive flue temperatures. This should be done by a qualified technician.
- Board diagnosis: If a new sensor does not clear E07, the control board may require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Flue Gas NTC Sensor
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