BoilerFaultCodesYour boiler is failing to detect a flame when it tries to work at a high power level, causing it to shut 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: No flame signal with high output
What causes this fault?
This fault happens because the boiler’s control system cannot detect a steady flame while the burner is trying to run at full power. It is often caused by a restricted gas supply, a worn-out ignition probe that can no longer sense the flame, or a physical blockage in the burner or flue system. Because the boiler cannot confirm it is burning fuel safely at high speeds, it shuts down as a protective measure.
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 2949 — 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.