C0 High
Your boiler's internal computer chip has lost connection or failed to communicate with the main control board, preventing the system from starting.
Technical description: Boiler chip card (BCC) activation fault
Typical repair cost: £180-350 (including labour)
DIY fix possible
Turn the boiler power off at the fused spur switchWait for 30 secondsTurn the power back on and press the 'Reset' button
Protect yourself from future repair bills
A boiler cover plan would cover faults like C0 — no call-out fees, no surprises.
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Parts commonly replaced
- Boiler Chip Card (BCC)
- Printed Circuit Board (PCB)
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