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Wireless one slots on front of boiler so no wires to connect think i need to bridge where the old wired one was

can any one help I have a vaillant ecotech pro 28 and I am trying to fit a salus st620 wireless stat - do I need to disconnect wired stat and fit a bridge wire as when fitting wireless receiver to combi boiler it all powers up but heating won,t turn on with thermostat thanks for any help