C6
Worcester Bosch
Fan Speed / Air Pressure Switch Fault
Boiler shows C6, fan speed or air pressure issues detected.
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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
Fan running at incorrect speed, Faulty fan speed sensor, Blocked flue, Faulty air pressure switch
How to Fix / Troubleshooting
Safety first: Do not remove the combustion cover or flue. Isolate power before any checks.
- Visual flue check: Ensure the flue terminal is unobstructed and not damaged.
- Reset boiler: Reset once and observe if the fan starts and runs smoothly.
- Engineer tasks: An engineer should measure fan speed feedback, test the air pressure switch, inspect pressure tubing, and replace the fan or switch if required.
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Repair Difficulty
Professional Required
5/5
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