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Thanks Mick. Yes, changing the batteries seem to have solved the 2nd problem. Or it might be the tweaking that has actually sorted it as it is a bit strange for a low battery stat to turn the Boiler On / Off when the Programmer is OFF ! Yesterday when I tried putting the CH and HW to...

By the way, I can hear the stat click when I set the temp above or below the room temp - which suggests that the relay is working. I replaced the batteries. Before I replaced them, it had another problem (in addition to the existing one) : when the CH was OFF, the Boiler could be turned OFF or...

I have a Wired Drayton Digistat 1 which is battery operated (2 cells). The Programmer is a Honeywell 6400C with 3 On/Off and 7 day setting and the Boiler is a Potterton Suprima. There is a Mid Position 3 port Valve. When the CH is ON through Programmer), the Boiler runs irrespective of what...