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The stat is located on the pcb of the boiler. When turned it does click the boiler off and on. I am wondering if a faulty/sticking modulating gas valve would cause these symptoms.

Hi folks Hoping for a bit of help/advice. I have a Worcester 24i RSF combi. When the central heating is on the rads are piping hot even on the lowest dail setting (no room stat fitted). I also hear at times a clicking noise from the boiler (relay clicking). I therefore changed the CH...