BoilerFaultCodesWhat the manual says
Manufacturer manualLow/zero pressure
What causes this fault?
This fault occurs when the water pressure inside your heating system drops below a safe operating level. The most common reasons are a slow leak from a radiator valve or pipework, or the air pressure inside the internal expansion vessel needing to be topped up by an engineer.
This issue is more frequent in autumn when the heating is turned back on after summer, as the change in temperature can cause weakened seals to leak or air pockets to move through the system.
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 Green LED On, Red LED Off: no call-out fees, no surprise bills.
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