A09
Riello
Return NTC Sensor Failure
Boiler shows return temperature sensor fault, may cycle rapidly or shut down
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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 return NTC sensor, Loose or corroded connector, Damaged sensor cable, Fault on main control PCB input
How to Fix / Troubleshooting
Safety: Turn off power before removing covers or unplugging sensors.
- Check wiring: Trace the return NTC cable from the return pipe to the PCB. Ensure it is intact and firmly connected.
- Inspect sensor: Look for physical damage or signs of overheating on the sensor body.
- Reset boiler: After reseating the connector, reset the boiler and observe. If the error remains, replacement is likely required.
- Replace NTC: Drain or isolate the boiler as needed, remove the faulty sensor, and install a new Riello return NTC sensor, ensuring correct sealing.
- PCB check: If a new sensor does not clear the fault, a technician should test and possibly replace the main control board.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Sensor
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