BoilerFaultCodesYour boiler's internal computer has encountered a critical error and can no longer control the ignition process or heating functions.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Lamp ON.
What causes this fault?
This fault occurs when the boiler's main control board suffers an internal electrical failure or loses the ability to detect a flame. The most common reasons include age-related component fatigue, moisture ingress, or electrical surges that damage the delicate circuitry responsible for managing the gas valve and ignition sequence.
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
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