9A 362 High
Your boiler’s internal computer chip is unrecognized or has been installed incorrectly, causing the system to stop working for safety reasons.
Technical description: error – incorrect HCM fitted
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 9A 362 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Heat Cell Monitoring (HCM) bit
- Printed Circuit Board (PCB)
*Affiliate links — we may earn a commission at no extra cost to you.