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Hi, 240 was switching fine so replaced the actuator on zone 2 valve and all good. Appreciate the info

Perfect thanks will get on that and let you know. Appreciate your great support!!

Perfect, had a look in the switched valve briefly last night didn’t see anything loose but will go again double check. Just for clarity do you know layout of cables, so TPOne B to where, TPOne M to where (both to switch box?) then a signal cable out boiler or?

Hey thanks! It’s new build only two years old, heating didn’t work when moved in due to poor connections in the switch box or somewhere (not controllers).

Hi New home with 2 zone heating, an issue with B showing heat however boiler doesn’t kick in. M downstairs absolutely fine everything works. Have linked out the normally open contact within B and still no firing up of boiler proving TPONEB is ok. Anyone aware as to whether TPOne B contact...