hi i have a worcester 24i rsf on lpg central heating not working and fan staying on have tried replacing thermister and pcb also have checked flow valve that seams to be working ok the hot water is ok its just the central heating side of things
Where did you get the PCB and how much did it cost?
I have encountered that symptom on that range of models caused by the PCB. Hoowever in one case it did come on when the sensor was disconnected momentarily for just one heat cycle.
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