BoilerFaultCodesYour boiler's main internal computer has developed a malfunction and can no longer control the heating system safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal fault (PCB)
What causes this fault?
This fault occurs when the boiler's main control board suffers a hardware failure and can no longer process data or send signals to other components. It is often caused by an electrical surge or the natural degradation of the solder joints and capacitors on the circuit board over time. Because the board acts as the brain of the system, the boiler stops immediately to prevent unpredictable or unsafe operation.
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 E05 — no call-out fees, no surprises.
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