F015 High
Your boiler has stopped working because one of its internal heat sensors has come loose or is not sitting correctly against the pipework.
Technical description: Mounting fault sensor S1
Typical repair cost: £100-£180 (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 F015 — 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
- S1 Flow Sensor
- NTC Sensor Clip
- Wiring Harness
*Affiliate links — we may earn a commission at no extra cost to you.