S.06 High
Your boiler is staying in a cooling-down phase for too long because it thinks the fan is still spinning after it should have stopped.
Technical description: Heating mode – fan overrun error
Typical repair cost: £150-£450 (including labour)
DIY fix possible
Press the reset button (indicated by a flame with a cross through it)Turn the boiler power off at the fused spur switch, wait 30 seconds, and turn it back onCheck for any visible obstructions or debris around the external flue pipe terminal
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.06 — no call-out fees, no surprises.
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Parts commonly replaced
- Fan assembly
- Printed Circuit Board (PCB)
- Wiring harness
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