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I have a central heating system with a separate zone for upstairs and downstairs each controlled by its own wall thermostat. I have a Ultrasteel 150L indirect mains pressure hot water tank with an imit dual thermosat on the side. I have 2 Drayton 2 port zone valves and these don't seem to be...

There are a couple of problems but first I'll try to explain my setup. I have a Ferroli Tempra 24 boiler, an unvented mains pressure Ultrasteel indirect 150L water tank and 10 radiators of various sizes over 3 floors. The upstairs radiators are controlled separately to the downstairs ones...