BoilerFaultCodesYour boiler has paused because it has detected a temporary issue, likely due to low water pressure or an intake problem, and is waiting for the condition to clear.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Temporary fault, e.g.: APS fault, low water pressure
What causes this fault?
This fault occurs when the boiler's safety sensors detect an unstable condition, such as the internal water pressure dropping too low or the air flow being restricted. The system enters a temporary pause to prevent damage, waiting for the correct pressure or air balance to be restored before it attempts to fire up again.
This issue often surfaces when the heating is first turned on after summer, as stagnant parts or small leaks can cause the system pressure to drop over periods of inactivity.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop valves to top up the system.Ensure the external flue terminal is not blocked by leaves, debris, or snow.Turn the mode selector switch to 'OFF/RESET' for a few seconds and then back to 'ON'.
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