C7
Worcester Bosch
Fan Not Running / Fan Supply Fault
Boiler displays C7, fan does not start or is not recognised.
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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
Failed fan motor, No power supply to fan from PCB, Loose fan connector, Seized fan bearings
How to Fix / Troubleshooting
Safety first: Isolate power and gas before accessing the fan.
Engineer steps:
- Check for 230V (or specified voltage) at the fan connector when the boiler calls for heat.
- If voltage is present but fan does not run, replace the fan assembly.
- If no voltage is present, inspect wiring and test the PCB fan relay/driver; replace PCB if faulty.
- Ensure the fan impeller spins freely and is not obstructed by debris.
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Repair Difficulty
Hard
4/5
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