F6 Low
Your boiler is having trouble reading the outdoor temperature, which it uses to help run your heating more efficiently.
Technical description: Outside sensor fault
Typical repair cost: £90-180 (including labour)
DIY fix possible
Check the external sensor on the outside of your house for any obvious damage or loose wiresTurn the boiler power off and back on to see if the fault clearsEnsure there is no debris or ice covering the outdoor sensor
Protect yourself from future repair bills
A boiler cover plan would cover faults like F6 — 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
- Outdoor weather compensation sensor
- External sensor wiring
*Affiliate links — we may earn a commission at no extra cost to you.