F.64 High
Your boiler has detected a communication problem between its internal sensors or a fault in its main control board, causing the system to shut down for safety.
Technical description: Electronics / NTC error
Typical repair cost: £150-450 (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 F.64 — 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
- Flow or Return NTC Thermistor
- Printed Circuit Board (PCB)
- Wiring Harness
*Affiliate links — we may earn a commission at no extra cost to you.