BoilerFaultCodesWhat the manual says
Manufacturer manualFault with mains supply, PCB fuse or low water pressure switch.
What causes this fault?
This fault occurs when the boiler's internal computer loses electrical power or detects that the water level has dropped too low to operate safely. It is often caused by a simple blown fuse on the control board or a leak in the system that has drained the pressure. Without this power or water pressure, the boiler shuts down completely to prevent any internal damage.
This issue often appears in autumn when the heating is turned on for the first time, as cold pipes and radiator bleeding can cause the system pressure to drop.
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 Neon 1 NOT lit: no call-out fees, no surprise bills.
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