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EF: Old thermostat to smart thermostat wiring issue

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EF: Old thermostat to smart thermostat wiring issue

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TheeMarko

Old thermostat to smart thermostat wiring issue

Hi all, quite new to this forums so hopefully this is in the right place.

I have a combi boiler, please see picture of the old wiring of the thermostat and how I have wired up the new smart thermostat. Boiler still comes on but no display to the thermostat. Also I tried 4 into 1 but still no luck. If anyone could advise please? [ElectriciansForums.net] Old thermostat to smart thermostat wiring issue[ElectriciansForums.net] Old thermostat to smart thermostat wiring issue

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