BoilerFaultCodesWhat the manual says
Manufacturer manualIs there 240V~ between pilot gas valve solenoid blue and brown connections? Isolate supply, test harness continuity. If satisfactory replace printed circuit board.
What causes this fault?
This fault occurs when the boiler's control system attempts to light the pilot flame but fails to receive the electrical signal or gas flow required to start the ignition process. The most common reason is an electrical failure in the main circuit board or a faulty solenoid preventing the gas valve from opening, meaning the boiler cannot safely begin the heating process.
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.
Avoid the next call-out bill
A cover plan would handle faults like neon4: no call-out fees, no surprise bills.
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