BoilerFaultCodesYour boiler's internal computer parts are struggling to talk to each other, which means the system cannot coordinate 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: Communication error
What causes this fault?
This fault occurs when there is a breakdown in the digital 'conversation' between the boiler's main control board and its other electronic components. It is usually caused by a loose connection in the internal wiring, moisture affecting the circuits, or the old age of the main computer board itself.
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 E37 — 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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