BoilerFaultCodesWhat the manual says
Manufacturer manualTemporary 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.
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.
Avoid the next call-out bill
A cover plan would handle faults like GREEN LED On every 0.5-secs: no call-out fees, no surprise bills.
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