BoilerFaultCodesYour boiler's main internal computer has lost touch with the front display screen, meaning they can no longer talk to each other to operate the heating.
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 with display control unit
What causes this fault?
This fault occurs when the electrical connection between the boiler's internal computer and the front control panel is interrupted or broken. The most common reason is a loose or damaged communication cable, though it can also be caused by moisture getting into the electronics or a component failure on one of the 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 E38 — 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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