BoilerFaultCodesTechnical description
Insufficient system pressure.
What causes this fault?
This fault occurs when the water level inside your central heating system drops below the minimum level required for the boiler to operate safely. The most common reasons for this are a small leak somewhere in your radiator pipework or the air being released from the system through a valve.
This fault is frequently seen in autumn or winter when the heating is turned on for the first time after being dormant for several months.
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.
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