E135 High
Your boiler's internal computer has encountered a software glitch or a communication error that is preventing it from running properly.
Technical description: Internal error
Typical repair cost: £280-550 (including labour)
DIY fix possible
Locate the reset button or turn the selector switch to 'R'Hold for 5 seconds and then releaseWait 2-3 minutes to see if the boiler restarts normally
Protect yourself from future repair bills
A boiler cover plan would cover faults like E135 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Wiring Loom
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