6 red flashes High
Your boiler has detected an internal communication or unexpected component fault and has stopped working as a safety precaution.
Technical description: Miscellaneous error.
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Turn the selector switch to the 'Reset' position and hold for 5 seconds.Release the switch and wait for the boiler to attempt to restart.Ensure your gas supply is active and your credit meter (if applicable) has funds.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 6 red flashes — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Wiring harness
- Gas Valve
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