A1 High
Your boiler has detected that there is not enough water circulating through the system, which could be due to a leak or a mechanical issue with the pump.
Technical description: Water is leaking or the pump needs replacing or freeing due to the pump running dry.
Typical repair cost: £180-£350 (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 A1 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating pump
- Internal seals
- Auto air vent
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