E25
Remeha
Internal temperature sensor fault (PCB or casing sensor)
Display shows E25, furnace may continue at reduced power
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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
Defective internal NTC sensor, Overheating of control compartment, Blocked ventilation around furnace, Faulty main PCB
How to Fix / Troubleshooting
Safety first: Isolate power before opening the control compartment.
- Check ventilation: Ensure that the furnace has adequate clearance around it and that ventilation grilles are not blocked.
- Inspect sensor: Locate the internal temperature sensor on or near the PCB. Check that it is securely mounted and its wiring is intact.
- Clean dust: Carefully remove dust buildup from the control compartment using a vacuum and soft brush.
- Measure sensor: A technician can measure the NTC resistance and compare it to specification. Replace if faulty.
- PCB replacement: If the sensor is integrated into the PCB and faulty, the entire PCB must be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Internal Temperature Sensor
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