BoilerFaultCodesWhat the manual says
Manufacturer manualWater pressure in CH system low
What causes this fault?
This fault occurs when there is not enough water in your heating system to maintain the required pressure for operation. The most common reason is a slow leak from a radiator valve or pipework, though it can also happen if air was recently bled from your radiators without the system being topped back up.
This issue is more frequent in autumn when homeowners turn their heating back on for the first time and discover that pressure has dropped over the summer 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.
Avoid the next call-out bill
A cover plan would handle faults like P0.5-0.9 bar: no call-out fees, no surprise bills.
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