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Heating controller and thermostat change


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All fixed.


You were right @ProDave


I think when I originally connected the receiver, I hit the heating and hot water buttons and it fired up the boiler.


But when I reconnected the original thermostat, the boiler did not fire up when just the heating was turned on, but it sounded like the heating was on as a pump fired up.


At that point I noticed in the instructions reference to " gravity-fed and part pumped" systems. The systems is not gravity fed, but it said that with part pumped systems, switching on the heating operates a pump to divert water to the heating, but the hot water relay switches on the boiler. As I could hear a pump come on when I switched on the heating, I thought this might be the issue.  I switched it into this mode and that fixed it.

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