E10
NTI
DHW Temperature Sensor Fault
Boiler shows E10; domestic hot water (DHW) may not function correctly
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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 or tank, Loose sensor wiring, Scale buildup causing sensor overheating, Control board input fault
How to Fix / Troubleshooting
Safety: Turn off power and close the cold water supply to the boiler if removing any DHW components.
- Locate DHW sensor: On combi NTI boilers, the DHW sensor is usually clipped to the plate heat exchanger or inserted into a sensor well on the DHW outlet.
- Inspect and reseat: Check the sensor body and wiring for damage. Reseat the connector at both the sensor and control board.
- Test sensor: Measure resistance and compare to NTI’s NTC chart. Replace if readings are incorrect.
- Check for scale: Excessive scale in the plate heat exchanger can cause localized overheating. If DHW temperatures fluctuate or are very hot, a technician should descale or replace the plate heat exchanger.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor (NTC)
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