E06
EHC
DHW Temperature Sensor Fault
Boiler locks out with E06 when hot water is demanded, heating may still work intermittently.
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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
Faulty DHW NTC sensor, Scale build-up around sensor pocket, Damaged sensor cable, PCB sensor circuit fault
How to Fix / Troubleshooting
Safety: Isolate electrical supply before working on the boiler.
User checks:
- Reset the boiler and run a hot water tap to see if the error reoccurs.
Engineer checks:
- Locate the DHW NTC sensor on the plate heat exchanger or DHW outlet on the EHC combi boiler.
- Measure resistance at ambient and under warm water flow; compare with EHC data.
- Inspect for limescale build-up around the sensor pocket; descale if necessary.
- Check wiring continuity back to the PCB and ensure connectors are firmly seated.
- If sensor values are correct, suspect PCB input failure.
Fit a new DHW NTC sensor if readings are unstable or outside specification.
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Repair Difficulty
Medium
3/5
Required Part
DHW NTC Sensor
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