6 Red Flashes High
Your boiler has detected a general internal error, often linked to a small electronic glitch or a sensor that is failing to communicate correctly with the main controls.
Technical description: Miscellaneous
Typical repair cost: £100-280 (including labour)
DIY fix possible
Locate the reset knob on the front control panelTurn the knob to the 'R' (Reset) position and hold for 5 secondsRelease the knob and wait to see if the error light clears and the boiler restarts
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
- Temperature sensors
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