We have had a new worcestor twin star 30cdi boiler and new central heating installed.
I have 7 radiators downstairs and 8 upstairs. I am finding that on occasion 1 rad downstairs wont come on and 2 upstairs.
The builders has tried removing air, balancing, replacing thermostats, turning up the heat on the boiler , none of these have solved the problem.
It is strange because occasionally they have come on, but then other rads wont come on. This week the problem has been consistent.
Anyone have any ideas what we should be looking at.