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Haven't tried that - what difference does it make? All suggestions are welcome and worth a try before I start ripping up floorboards or shelling out lots of money... Cheers Update - I've now found a *mysterious* red valve in the kitchen cupboard containing the boiler. I opened it and...

:wink: He suggested leaving the cleaner for a week and then draining and re-filling to see if that did the trick. He also said we could get it power flushed - is that expensive?

Hello, Have recently moved to a new house. Have a \\\"normal\\\" gas central heating system - boiler in the kitchen, hot water tank in the bathroom, thermostat, mid -pos valve etc. Downstairs all the radiators work. Upstairs, none work, except the bathroom rad which gets nice and hot...