BoilerFaultCodesTechnical description
Water Pressure Switch Not Operated
What causes this fault?
This fault occurs when the system water pressure drops below the minimum level required for the boiler to heat up safely. The most common reason is a small leak in the radiator network or pipework, but it can also happen if you have recently bled your radiators without topping the water back up. When the internal sensor detects this lack of pressure, it cuts the power to the burner to prevent the unit from overheating.
This issue often occurs at the start of autumn when homeowners turn their heating back on for the first time or bleed their radiators to remove air pockets.
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.