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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

if I turn upstairs off and then turn on the downstairs , the downstairs works fine

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

sorry mate , wouldn't have a clue , I wouldn't like to guess. its a standard installation ,

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 pump has had the air bled out , so no air lock in pump

22mm , and its a suprima 40.

Ive done the TRVs, sprayed them with WB40 also they are fine. looks like it is the 3 way valve

Yes , always hot

Yes!! just finding one on Teesside that wants the job?

It has been a steep learning curve... So can a 3way valve stick , resulting in the rads upstairs hot and the downstairs cold?

I totally agree a little bit of knowledge is a dangerous thing.

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...

thanks for the advice,

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.

Over the years my Potterton Suprima Bolier hasn't been the best, It is 12 years old and has had several new parts. Over the last 6 months the central heating has become practically non existant. Only works upstairs cold downstairs In October I had a NEW PCB fitted and pump fitted...