I have a sime 80c format combi boiler. The pressure is all screwed up. On the dial the red hand is at 1 and the black is at 2.5. I've been told that i need to realese the pressure so that the black hand is below the red one. If we try to run the hot tap on the bath you have to let it run really really slowly or the water just goes cold. Can anyone help?
you need to let some pressure off on a drain off cock or by venting a rad,if the bath tap pipe is still 22mm that will be why you have to reduce the flow,should be 15mm
