TPOne M and TPOne B setup/relationship with boiler and wiring centre

[LB100]

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 cable connects to TPOne M or does it go to wiring centre? Also ultimately how do these controllers (or wiring centre) connect to the boiler as I don’t see any cables coming into boiler except mains power?

Am an electrician historically by trade but not for a number of years and tend not to get involved these days but just checking the basics has my mind questioning the setup.

Regards!

 

[Deleted member 267285]

Sounds like a loose/broken switch live for the motorised valve or a failed motorised valve. How new is the house, are we talking new build or new to you?

 

[LB100]

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).

 

[Deleted member 267285]

I would be looking at the motorised valve switch live back to the boiler or the switch live into the valve actuator

 

[LB100]

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?

 

[Deleted member 267285]

Have a look in here (circled red), if you have any test gear, create your demand for the tpone b and check the brown in with a known earth or neutral, should get 240vac. If you get the voltage then suspect the actuator/motor. I won't know which is which by layout

 

[LB100]

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

 

[LB100]

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