What does the Worcester Bosch C6 fault code mean?
The C6 fault code indicates that the boiler’s fan speed is too low or that the fan itself may be defective. This can lead to insufficient combustion air, causing the boiler to shut down for safety reasons.
Common Causes
- Faulty Fan: The fan may be malfunctioning or have failed completely, preventing it from operating at the required speed.
- Blocked Air Intake: Obstructions in the air intake can restrict airflow, leading to low fan speed and triggering the fault code.
Can I fix it myself? (DIY)
This issue typically involves components that require professional handling. A Gas Safe Engineer is required to diagnose and repair the fan or any related issues safely.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing a C6 fault may range from £150 to £400. This includes approximately £100 to £250 for a replacement fan and £50 to £150 for labor, depending on the complexity of the repair and the engineer’s rates.