BoilerFaultCodesYour boiler's internal computer has encountered a critical error and needs a professional to inspect or replace it.
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 or a memory error that prevents it from managing the heating safely. The most common reason is electrical fatigue of the small components on the board or a short circuit caused by age. Because the 'brain' of the boiler can no longer process instructions, it shuts the system down to prevent further damage.
This fault can sometimes follow heavy summer thunderstorms, as power surges or nearby lightning strikes are known to damage sensitive electronic circuit boards.
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.
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A boiler cover plan would cover faults like E06 — no call-out fees, no surprises.
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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.
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