BoilerFaultCodesTechnical description
check the wiring harness
What causes this fault?
This fault occurs when the boiler's main control centre loses the ability to talk to the internal components that regulate heat and safety. It is typically caused by a loose electrical connection, a damaged wiring loom, or a failure within the printed circuit board itself. Think of it like a loose cable on a computer that prevents the hardware from receiving instructions properly.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →