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Got it sorted, after I replaced the thermostats and control panel I checked the downstairs DS motor valve and it was frazzled. As Agile said it could be set to manual until I bought a new one and got in swopped out.

Hi I have a Warmflow Combi boiler 70/90 and a couple of days ago we turned the heating on and only the upstairs came on. I increased the pressure in the system as it was a tad low and also turned the heating up full incase there was an air lock of some sort (can there be in a pressurised...