underfloor heating zone issues

[keithreardon]

Anybody come across this? Six zones on simple thermostats. Seven loops, one zone on two loops. Turn up all the thermostats and all zones heat up. Turn down all thermostats and all zones cool down. Turn up either of the biggest zones and none other, and three zones heat up, including the respective intended zones. Turn up a different small zone only and it heats up but brings on another one. Now this other one has been coming on so far in each case. Haven't had time to go through every combination yet. Any ideas?

 

[Gray0689]

It's wired wrong

 

[Ermintrude]

Yep or one or more of the heads arnt on properly

 

[keithreardon]

Thank you, Gray0689 and Ermintrude. I did check all the head are down tight. I thought some of the actuators may be faulty, but that wouldn't quite add up, in this case. As Gray suggests, I will get the electrician in.