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Hi Tony Thanks for prompt answer I will try and look at them next week and come back to you Cheers Nick

Hi I have exactly same problem with 2 boilers in some offices Ch runs fine for months ( I turned off cold in so no draw on HW if if a tap opened) But with cold feed back on - turn on hot tap and it works and will run for as long as you like - turn off tap and the boiler shuts down. I have...