BoilerFaultCodesWhat the manual says
Manufacturer manualLoss of pressure in heating system
What causes this fault?
This fault occurs when the water level inside your central heating system drops below the minimum safe threshold required for operation. The most common reasons are a slow leak from a radiator valve or pipework, or a failing internal component like the expansion vessel which helps manage pressure changes.
This issue is frequently seen in autumn when the heating is turned back on after summer, as the sudden heat can stress weakened seals or joints.
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 P0.1-0.4 bar: no call-out fees, no surprise bills.
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All 59 fault codes on the Powermax HE
Seeing a different code? Every code this model can display, in one place.