BoilerFaultCodesTechnical description
System pressure too low
What causes this fault?
This fault occurs when the water pressure inside your heating system drops below 0.5 bar, which is too low for the boiler to safely heat your home. The most common reasons are a leak somewhere in your pipework or radiators, or because the system was recently bled and hasn't been topped back up with water.
This issue is more common in autumn when homeowners turn their heating back on for the first time and discover pressure has naturally seeped out 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.
Find a Gas Safe engineer
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