F41
Protherm
Flow Temperature Sensor / Control Deviation
F41 displayed; appliance may not regulate power correctly.
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Possible Causes
Slow or drifting NTC sensor, poor thermal contact to pipe, control algorithm detecting unstable readings, wiring interference.
How to Fix / Troubleshooting
Safety first: Isolate power and allow the unit to cool.
- Check sensor mounting: Ensure the flow NTC is firmly attached to the pipe or in its pocket, with thermal paste if specified.
- Inspect wiring: Keep sensor cables away from high-voltage or ignition cables.
- Replace NTC: If readings are unstable or out of tolerance, replace the flow NTC sensor.
- PCB check: If a new sensor does not resolve F41, the PCB input may be faulty.
Warning: Incorrect temperature control can lead to scalding or poor performance; verify operation after repair.
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Repair Difficulty
Easy
2/5
Required Part
Primary Flow NTC Sensor
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