FA9 High
Your boiler's internal communication system has lost power, meaning the different components cannot talk to each other to start the heating process.
Technical description: eBUS fault – voltage too low
Typical repair cost: £120-£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 FA9 — 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
- Main PCB
- External eBUS Controller
- Wiring Harness
*Affiliate links — we may earn a commission at no extra cost to you.