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Tado x smart thermostat and Junkers boiler

Hi everyone,

I have a Junkers boiler and a Fw120 thermostat that I want to change for a tado x smart wired thermostat that I just bought.

My Fw120 thermostat has b1 and b4 wires connected, also a b2 wire not connected. Do you know where those wires from the boiler should be plugged on the tado x smart thermostat? I tried the + and - ports but the temperature keeps increasing then.

Thanks in advance!
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