A8 362 High
Your boiler is struggling to operate because the electrical power reaching it is unstable, insufficient, or the control module has failed to recognize the incoming voltage.
Technical description: Low mains voltage – the voltage may be interrupted, inconsistent or heat control module (HCM) invalid
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 A8 362 — no call-out fees, no surprises.
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Parts commonly replaced
- Heat Control Module (HCM)
- Main PCB
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