ST620WBC Thermostat temp issue

30 Dec 2020
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United Kingdom
I have a Worchester boiler and just got the Salus ST60WBC thermostat which I have connected. However, it works in reverse order. Heating only comes on when the temperature set on the RF is lower than the room temperature (instead of the other way around). What can I do to sort this issue.
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Just sounds as thought the switching wires are wrong way around. Is it the one that clips into boiler?

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