E16
Chaffoteaux
Return Temperature Sensor (NTC) Fault
Boiler intermittently shows E16, temperature readings appear inconsistent, boiler may cycle rapidly.
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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
Faulty return NTC sensor, Loose sensor clamp on pipe, Damaged wiring harness, Poor PCB connection
How to Fix / Troubleshooting
Safety first: Isolate power before accessing sensors and wiring.
User-level checks:
- Reset the boiler and observe if the error is sporadic or constant.
Technical checks (qualified personnel):
- Locate the return NTC on the return pipe to the boiler.
- Check that the sensor is firmly attached and has good thermal contact with the pipe.
- Measure resistance and compare with the NTC curve; replace if out of tolerance.
- Inspect wiring and PCB connector for damage or corrosion.
After replacement, monitor boiler operation to ensure stable flow and return temperatures.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Temperature Sensor
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