A8 High
Your boiler has lost its connection to the external heating controls, meaning it cannot receive instructions on when to turn on or off.
Technical description: Break communication to FX sensor controls electrical connections need checking.
Typical repair cost: £90-£250 (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 A8 — no call-out fees, no surprises.
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Parts commonly replaced
- FX Receiver
- RF Heating Controls
- Wiring Harness
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