BoilerFaultCodesYour boiler's internal computer brain has developed a communication fault and cannot operate properly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal control unit error
What causes this fault?
This fault occurs when the boiler's internal electronic motherboards lose the ability to speak to each other or process data correctly. It is usually caused by age-related wear to the capacitors on the circuit board or a loose physical connection between the main controller and the front display panel.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like E15 — no call-out fees, no surprises.
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