BoilerFaultCodesTechnical description
Is there 230V~ between K1 and N? Check 0.2 Bar of water pressure is available at boiler. If ok, Replace water pressure switch.
What causes this fault?
This fault occurs when the internal sensors detect that there isn't enough water pressure inside the system to safely heat your home. The most common reason is a slow leak in the pipework or radiators, though it can also happen if the system was recently drained and not refilled correctly. Without sufficient water, the boiler shuts down to prevent the internal components from overheating and sustaining permanent damage.
This issue often appears in autumn when homeowners turn their heating back on for the first time, as the system may have lost pressure gradually 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.