BoilerFaultCodesTechnical description
Temporary fault, e.g.: APS fault, low water pressure
What causes this fault?
This fault occurs when the boiler's internal computer receives an unexpected reading from a safety sensor, such as the water pressure being too low or the fan not moving air correctly. The boiler enters a temporary standby mode to prevent damage while it waits for the system conditions to return to normal. The most common reason is a simple drop in system pressure that requires the heating loop to be topped up with water.
DIY fix possible
Check the pressure gauge on the front of the boiler; if it is below 1 bar, top it up to 1.5 bar using the filling loop.Ensure the blue mode selector switch is set to the 'ON' or 'DHW' position.Turn the selector dial to 'Reset' for a few seconds and then back to your desired setting.