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Horstmann ChannelPlus H37XL Series 2 challenges

C

Copperplated

Joined
29 Mar 2023
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I've moved into a house with a Horstmann ChannelPlus H37XL series 2 with 3 zones. The zones are upstair radiators, bathroom towel rails and hot water. The challenge I have is with the radiators. The heating is set on auto with timings so between certain hours of the day the heating should not be running. On the wall upstairs is a standard thermostat with a dial you turn. If I turn the thermostat up past the "click" during the times that the heating is not set to come on, the radiators start to heat up. Any ideas why the thermostat seems to operate as if the heating is in manual rather than auto?

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