F10
Viessmann
Control Board / Internal Electronics Fault
F10 displayed, unit will not start, often after power disturbances
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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
Corrupted control board firmware, Damaged main PCB from power surge, Loose multi-pin connectors on PCB, Moisture ingress into electronics compartment
How to Fix / Troubleshooting
Safety: Disconnect power at the breaker before accessing the control compartment. Static discharge can damage electronics; avoid touching PCB tracks directly.
- Power cycle: Turn off power for at least 5 minutes to allow capacitors to discharge. Restore power and see if the F10 clears.
- Inspect PCB area: Remove the front cover and access the control board. Look for signs of moisture, corrosion, or burnt components. If moisture is present, identify and fix the source of leaks before drying the area.
- Check connectors: Gently reseat all multi-pin connectors to the main PCB, ensuring they are fully latched. Pay attention to the display cable and sensor harnesses.
- Surge protection: If F10 occurred after a storm or power surge, consider installing a surge protector on the supply circuit.
- Professional replacement: If F10 persists after basic checks, the main control board likely needs replacement and re-commissioning by a Viessmann-authorized technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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