A10
Riello
DHW NTC Sensor Failure
Boiler indicates domestic hot water (DHW) sensor fault on combi or system boiler with cylinder sensor
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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 probe, Broken sensor wiring, Loose connector at PCB, Scale build-up around sensor pocket
How to Fix / Troubleshooting
Safety: Isolate electrical supply and close water isolation valves before working on DHW components.
- Locate DHW sensor: On combi boilers, the DHW NTC is usually on the plate heat exchanger. On system boilers with cylinders, it may be a cylinder probe.
- Check connections: Ensure the sensor plug is secure and the cable undamaged.
- Descale (if accessible): If the sensor is in a pocket on a DHW cylinder or plate exchanger, scale may affect readings. A professional can descale or replace the sensor pocket.
- Replace sensor: Fit a new Riello-compatible DHW NTC sensor if the fault persists after connection checks.
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Repair Difficulty
Medium
3/5
Required Part
DHW NTC Sensor
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