Must all be fed off the one mains,And when someone else uses a mains fed outlet yours is last on the line.
You can avoid it by using a tank and then pumping into your combi
Sounds like poor mains pressure,does ewch property have its own mains?could be shared..
You could solve it by using a break tank and then feed into a pump to pressurise all your outlets.
Did you turn the valves off to the tap as in turn the colds off and run the hot only..this will tell if there is a problem in a fixture of cold crossing into hot
I would not accept that for a fix!it should work properly from new from the factory,and if they cant make that happen without adding putting i would want a new one or change of brand.
only thing if can be is the syphon isnt sealing properly and allowing water to pass into the pan or else the water level too high in the cistern and its overflowing into the pan!
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