BoilerFaultCodesTechnical description
Bleeding test program: The heating circuit and the hot water circuit are bled via the automatic bleeding valve
What causes this fault?
This occurs when air becomes trapped within the boiler's internal heat exchanger or the wider central heating pipework. It is typically triggered automatically after the system has been drained for a repair or when the water pressure has recently been topped up, as new water introduces small air bubbles into the system.
This is most common in autumn when homeowners turn their heating back on for the first time or after summer maintenance work has been completed.
DIY fix possible
Wait approximately 6.5 minutes for the program to finish automaticallyEnsure your radiator valves are open to allow air to moveCheck your boiler pressure once the cycle ends and top up if it has dropped below 1.2 bar