I have a problem with my heating system (indirect unvented - with a cylinder). In order for the hot water to be heated my central heating needs to be on. If the central heating is not on (and the boiler is already fired up) the boiler does not fire up and heat water for the hot water cylinder. This is a real pain as it means we have to force the central heating to be on to get any hot water.
I have come across a Drayton zone actuator valve in the airing cupboard and wonder if this could be faulty? Or something else?
Other info that may be relevant is that the central heating has 2 zones - upstairs and downstairs - each controlled with their own thermostat and timing panel.
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