BoilerFaultCodesYour boiler is struggling to keep its burner lit and has shut down after multiple failed attempts to maintain a flame.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Frequent flame failure (12 times).
What causes this fault?
This fault occurs when the boiler's internal computer detects that the flame is repeatedly flickering or cutting out shortly after ignition. It is usually caused by a dirty or worn sensing probe that can no longer 'see' the flame, or a fluctuating gas supply that prevent the burner from staying lit. After twelve unsuccessful attempts to maintain a steady flame, the boiler shuts down as a safety precaution.
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 E128 — 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.