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what is the purpose of this valve - and why is there a manual override to make it work ? - [dont really know how Central heating systems operate] I'll check the operation soon.

Now, all rads are hot - but only when the 3 port valve is locked in the open position. In the normal position - heat does not get pumped round the system :? Thanks for the help so far :)

OK when I lock the valve open the upstairs radiators get hot, one downstairs gets warm and the other one downstairs - nothing. so we have a bit of progress. What next ? [Have moed it back into it's default setting for the time being]

ok, pipes get hot boths sides of pump so it is moving though the pump - if I switch the 3 port valve then heat gets transfer round the other pipe - then it switches back. I'll check the locking of the 3 port valve and find a bleed bit later [not there now]. I will double check to see if the...

don't know what you mean about a 2 or 3 port valve :?: there is a T junction with a sevo'ed switch on it - if I move this then it moves back automagically Thermostats are set correctly

Pump was operating, and oozing water - no air in that part of the system. I have switched all radiators off [apart from the nearest one] to see if that helped - nothing seemed to change :(

Boiler is a Baxi Solo 2 40 RS CH System is not Sealed - head tank style. TIA

Last week the CH system stoped working :( I've de-gunked the system [ it needed doing], flushed it and refilled. all radiators have been blead. the pump is <12 months old - and makes the right sort of noises - it's bleed vavle has been shown to be free of air. when the CH is on the...