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The problem has finally been resolved, at least for the time being. A series of tests with a multimeter identified power on the switched live with the programmer off. The Drayton ZA6 motorised valve has a removable actuator which can be easily removed. By unscrewing the cover the micro switch...

'Ideal' technical have suggested it is a system problem. I thought that if the motorised CH valve was seen to be returning then it is functioning but if I understand you correctly then this is not the case, it may appear to be working from the outside but stuck on internally. I have felt the...

It has a mtotrised valve on the CH side and a separate valve to the cylinder which I think makes it an s plan system. The boiler doesn't get hot because it doesn't fire up (unless the programmer allows and the room stat is up). When the programmer is calling and the stat is teurned right up it...

I have an ideal icos he12 boiler which is attemtping to ignite even when the external controls are not calling for heat. It attempts to ignite on a continous 3 to 4 minute cycle even though the room stat is at 10 deg C and the programmer is switched off. I have checked the stat and it does...