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So far had the PCB, fan and APS replaced and still the red lockout fault light is flashing intermittently, anyone any ideas what component might be the faulty one? If it helps I heard a what sounded like air escaping from the boiler right before the red light started flashing tonight, sounded...

hi everyone, The boiler is a vokera option boiler and the problem i'm having is that the red fault light keeps flashing, the boiler works but when I call for hot water or turn on the central heating the boiler fires up for around 10-15 seconds then the boiler shuts down and the red fault...