Your boiler is struggling to detect the flame it needs to stay lit, which means it is shutting down for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flame circuit error
What causes this fault?
This fault occurs when the boiler's control system loses the signal that confirms a flame is present, causing it to shut down for safety. The most common reason is a buildup of carbon or debris on the sensing probe, or a loose electrical connection between the probe and the main control board.
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 8 — 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.