153 High
Your boiler has been manually reset too many times and has temporarily locked itself to prevent further issues.
Technical description: Forced reset unit unlocked
Typical repair cost: £0-120 (including labour)
DIY fix possible
Switch the boiler electrical supply off at the spur switchWait for at least 30 secondsSwitch the power back on to allow the system to clear the lockout
Protect yourself from future repair bills
A boiler cover plan would cover faults like 153 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Software reset)
- PCB (if error persists)
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