E10
Remeha
Domestic hot water (DHW) sensor fault
Furnace shows E10, no heating or hot water
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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 DHW NTC sensor, Loose or corroded sensor connector, Damaged sensor cable, Scale build-up around sensor pocket
How to Fix / Troubleshooting
Safety first: Isolate electrical power and allow hot water components to cool before touching.
- Locate DHW sensor: On combi-type Remeha furnaces, the DHW NTC is usually mounted on the plate heat exchanger or DHW outlet pipe.
- Check wiring: Ensure the sensor plug is firmly connected and the cable is not damaged or pinched.
- Resistance test: With power off, measure the sensor resistance at known temperatures and compare with Remeha's NTC chart. Replace the sensor if readings are incorrect.
- Descale if needed: Heavy limescale around the sensor pocket can cause incorrect readings. A technician may need to descale or replace the plate heat exchanger.
- PCB input check: If a new sensor does not resolve E10, the main PCB DHW sensor input may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor (NTC)
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