E0
Remeha
No communication between main control PCB and user interface
Furnace does not start, display shows E0 immediately after power-up
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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
Loose harness between main PCB and display board, Defective user interface board, Defective main control PCB, Low supply voltage to electronics
How to Fix / Troubleshooting
Safety first: Switch off the furnace using the main power switch and isolate it from the mains supply. Wait at least 5 minutes before removing any covers. Only qualified persons should access internal components.
- Check supply voltage: Verify that the furnace is receiving the correct mains voltage (typically 230 V AC in EU). If voltage is low or unstable, contact an electrician.
- Inspect display cable: Remove the front panel and locate the low-voltage harness between the user interface (display) and the main control PCB. Ensure the plug is fully seated on both ends and that no pins are bent or corroded.
- Check for damage: Look for pinched, cut, or burned wires in the harness. If damaged, replace the harness.
- Power cycle: Restore power, then turn the furnace off and on using the main switch to see if the error clears.
- Board replacement: If the harness is intact and voltage is correct but E0 persists, the fault is likely in the user interface board or main control PCB. Replacement should be done by a certified Remeha technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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