BoilerFaultCodesYour boiler is having trouble talking to your wireless thermostat or smart controller, meaning it doesn't know when to turn the heating on.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Configuration to external device unsuccessful – check pairing to external device.
What causes this fault?
This fault occurs when the boiler's internal computer loses its digital connection with your wireless thermostat or smart hub. The most common reason is a simple loss of signal between the devices, often caused by dead batteries or electrical interference from other household gadgets.
DIY fix possible
Check the batteries in your thermostat or wall controller and replace them if necessaryMove your wireless thermostat closer to the boiler to see if it reconnectsPress and hold the pairing button on the receiver box near the boiler to re-establish the connection
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E.02 – .48 — no call-out fees, no surprises.
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