A5 High
Your boiler has detected that the water pump is likely stuck or not moving water correctly, which means the system cannot heat up safely.
Technical description: N/A
Typical repair cost: £180-450 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like A5 — no call-out fees, no surprises.
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Parts commonly replaced
- Internal circulation pump
- Pump motor head
- Main PCB
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