BoilerFaultCodesWorcester Bosch C1264 Fault Code
The Worcester Bosch C1264 fault code means: your boiler has stopped working because the internal fan, which is needed to safely clear waste gases, has either lost power or stopped communicating with the main control board.. It appears on 3 Worcester Bosch models in our database.
Technical description: No control signal or power supply to the fan during operation
What causes the Worcester Bosch C1264 fault?
This fault occurs when the boiler's computer sends a command for the air fan to spin, but the fan fails to respond or loses power. The most common reason is that the fan motor has burnt out or the electronic control board has suffered a component failure, preventing it from sending electricity to the fan. This creates a safety risk, as the boiler cannot guarantee that dangerous exhaust fumes are being pushed out of the flue.
This fault is slightly more common in winter when the boiler is working harder, as the fan motor is under constant mechanical stress and is more likely to fail during periods of heavy use.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the C1264 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch C1264 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026