BoilerFaultCodesTechnical description
Boiler off because pressure too low. Replenish CH system & purge air. Find leak(s) and repair.
What causes this fault?
This fault occurs when the water inside your central heating system drops below the minimum level required for the boiler to operate. The most common reasons are a slow leak from a radiator valve or pipework, or a loss of air pressure inside the expansion vessel which causes water to be expelled through the safety valve.
This issue is frequently seen in autumn when the heating is turned on for the first time after summer, as joints may have contracted or weeped while cold.
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
Search the official register →