BoilerFaultCodesYour boiler's main control panel is failing to communicate with the internal system because they are not compatible or there is a software mismatch.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: User interface not compatible with boiler
What causes this fault?
This fault occurs when the boiler's internal computer and the front display panel are unable to talk to each other correctly. It most commonly happens after a repair where a replacement part has been installed that doesn't match the specific software version of your boiler, or if a component has suffered an electrical surge.
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 20 — no call-out fees, no surprises.
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