25 High
Your boiler's internal computer has encountered a memory processing error, causing it to shut down for safety.
Technical description: CRC error
Typical repair cost: £250-450 (including labour)
DIY fix possible
Turn the boiler power switch off at the wallWait for 60 secondsSwitch the power back on and press the reset button
Protect yourself from future repair bills
A boiler cover plan would cover faults like 25 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Control Module
*Affiliate links — we may earn a commission at no extra cost to you.