E06
Termet
DHW Temperature Sensor (DHW NTC) Fault
Boiler shows E06, domestic hot water (DHW) does not heat, DHW temperature reading is incorrect or unstable.
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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
Failed DHW NTC sensor on plate heat exchanger, Loose or corroded sensor connector, Broken cable between DHW NTC and PCB, Faulty PCB sensor circuit
How to Fix / Troubleshooting
Safety first: Isolate power and close the cold water inlet if removing any DHW components.
User checks:
- Confirm that E06 appears only when a hot water tap is opened.
- Reset the boiler. If the error reappears consistently, professional service is required.
Technician checks:
- Locate the DHW NTC sensor on the domestic hot water outlet or plate heat exchanger.
- Measure sensor resistance and compare with Termet specifications at known temperatures.
- Inspect wiring and connectors for moisture ingress or damage.
- Replace the DHW NTC sensor if readings are out of range; if readings are correct, test the main PCB.
After replacement, check for leaks around the sensor pocket and verify correct DHW temperature regulation.
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Repair Difficulty
Medium
3/5
Required Part
DHW NTC Sensor
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