BoilerFaultCodesYour boiler thinks it can still see a flame inside after it has been told to turn off, which is a safety conflict.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame detected even though boiler switched off.
What causes this fault?
This fault occurs when the boiler's internal sensor continues to detect a flame signal even after the gas valve has been closed. The most common reason is a sensor that has become contaminated or damaged, or a electrical fault in the control board that incorrectly interprets background electrical 'noise' as a live flame.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like F7 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.