I rebalanced in August , and it worked. However as soon as you turn off the heat demand your back to square 1 and it wont work.
it tends but not always if the heatings on for a few hours , eventually but not always you get some heat In the downstairs rads
again "a little bit of knowledge"
I was told if it was sludge , the water would be black , it was clear like mountain spring. Didn't take off the rads one by one as was advised this way was easier way of clearing sludge
thanks, what ive found is as soon as you explain the problem , no heat in rads , most heating engineers have just presumed faulty pump , or power flush and when ive explained the new parts installed , many not too fussed about the job!!
The heating engineer that replaced the PCB and pump were potterton on a no fix no fee basis. So I did get a free PCB and pump for nothing.
I rather pay for a quote and have the peace of mind. Two quotes within 24hrs , one said the boiler was kettling and that was why , the other charged me...
Forgot to add. In August. I drained down all the rads , by adding a hose pipe to the bottom rad in the kitchen and then , going in loft and tying up ballcock so it went empty
opened up all valves upstairs and water came out no sludge.