5 High
Your boiler has detected an issue with the sensor that monitors the temperature of the water heading to your radiators, causing the system to stop working for safety.
Technical description: Heating flow sensor fault
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 5 — 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
- Heating flow NTC sensor
- Wiring harness
*Affiliate links — we may earn a commission at no extra cost to you.