E17
Viadrus
Return Temperature Sensor (NTC) Fault
Boiler shows E17, no heating, and the return temperature reading is abnormal or fixed.
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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
Open or shorted Viadrus return NTC, Loose sensor connection, Corroded sensor pocket, Damaged sensor cable
How to Fix / Troubleshooting
Safety first: Turn off power and allow the boiler to cool before handling pipe sensors.
Step-by-step checks:
- 1. Compare flow and return readings: If the display shows unrealistic return temperature compared to flow and actual pipe temperature, suspect the return NTC.
- 2. Inspect sensor: Locate the return NTC on the return pipe. Check that it is firmly attached and that the cable is intact.
- 3. Clean and reseat: If the sensor is in a pocket, remove it, clean any corrosion, and refit fully.
- 4. Replace if necessary: If the sensor is visibly damaged or tests out of range, replace it with a Viadrus-approved part.
When to stop: If replacing the sensor does not clear E17, the PCB input may be faulty and requires professional attention.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Temperature Sensor
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