P.01 Medium
Your boiler has failed while running a specific test used for commissioning or high-power performance checks.
Technical description: Maximum load test program error
Typical repair cost: £80-160 (including labour)
DIY fix possible
Turn the boiler power off at the wall or fused spurWait 60 secondsTurn the power back on and press the 'Reset' button (indicated by a flame with a line through it)
Protect yourself from future repair bills
A boiler cover plan would cover faults like P.01 — no call-out fees, no surprises.
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Parts commonly replaced
- None (usually a software/setting reset)
- Printed Circuit Board (PCB)
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