BoilerFaultCodesYour boiler's internal computer has developed a fault and is unable to send the correct signals to start the heating process.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Electronic control board fault
What causes this fault?
This fault occurs when the boiler’s internal electronic brain suffers a communication failure or hardware breakdown. The most common reason is age-related wear on the circuit board's components or a sudden electrical surge that has damaged the delicate pathways required to manage the heating cycle.
This fault is slightly more common during winter when the boiler is working at maximum capacity, as the increased heat and constant cycling can cause aging electronic components to finally fail.
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 F11 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm 30ci Plus is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.