What happens if you turn off your upstairs radiators?
Do you get better heat downstairs?
You may just need to balance your system.
Try turning off your rads upstairs and then just open them 1/4 turn
tried that dont think thats the prob. Also eg in the mornings both CH and DHW on and all downstairs rads cold. I have to turn off DHW then they will heat up.....slowly.
ps last on last winter and all was ok
i am currently running a desludger through the system
also played around with the pump speed i believe its funning at its fastest
ok, is there a valve on the outlet from the cylinder?
It still sounds like a balancing problem and it would prefer to go through the cylinder as it is easier than going downstairs
can you balance the heating with the hot water off and then programme the hot water to come on at different times - before the heating?
ps cant see a valve on the cylinder i understand that would prob solve the balencing between DHW and CH
ok, time to try and balance everything.
if you give every part of the system the same resistance then it will all run the same
Try with the hot water turned off and the upstairs only open 1/4 turn, give it 5 mins then the one still cool open another 1/4 turn
repeat until done
ok will try but is it poss that there is a blockage in the feed after the last upstairs rad that is working and hence no feed can get downstairs which is why they are all cold?
all balenced still poor heating. Have been steered towards boiler apparently its switching on/off all the time, replaced PCB still the same, next is heat exchanger which is expensive, whats ur thoughts?