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Yeah appreciate it's difficult to diagnose online, a friend of mine who understands plumbing( I have no idea ) suggested the T being wired the wrong way round, said should be on last return , is this the same as what you are saying ie the colours of the wires being wired wrong?

He said the whole valve got changed, I'm thinking something went wrong when they replaced the heating cylinder. Any thing they could have put back wrong when they replaced the heating cylinder?

Hi appreciate any advice really When we turn the water heating on to heat the water the radiators come on and heat up even though the heating switch is off and thermostat is turned Down. It's an old style system, not combi boiler. Hot water tank, where water is heated and stored. We...