C6
FAULT CODE
Worcester Bosch
Fan Speed Error
High Severity
Engineer Required
The boiler fan is not running at the correct speed. This prevents safe ignition as the fan must reach the required speed before gas is allowed to flow.
Step-by-Step Fix Guide
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Step 1
Do not attempt fan repairs yourself
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Step 2
Turn off the boiler
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Step 3 Engineer only
A Gas Safe engineer needs to test the fan motor, fan speed sensor, and wiring
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.