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I'm trying to repair a Y-plan central heating system and have traced the problem to the mid position valve. It's the Tower version of this device. The device seemed permanently in mid position and never produces a voltage on the orange wire. However, I then discovered that when it's switched...

I have just started investigating anew the heating setup at my girlfriend's flat. The heating system is currently bodged to use the hot water channel only of the CH controller, using the controller's timer. The zone valve does not work and is permanently in a "hot water plus CH" mode and the hot...