BoilerFaultCodesYour boiler is having trouble 'talking' to your wall-mounted thermostat or remote control unit.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Appliance is connected to the optional remote control (RC05) and there is a communication problem.
What causes this fault?
This fault occurs when the digital handshake between the boiler's internal computer and the wall-mounted controller is broken. The most common reason is a loose or damaged connection in the low-voltage wiring that links the two components, though it can also be caused by an internal electronic failure within the remote control unit 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 05 — no call-out fees, no surprises.
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