vaillant turbomax

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    Wiring for Vaillant Turbomax 828E and Wireless Thermostat

    Hi Guys Bought new Tower RFNP wireless thermostat to replace old hard-wired one but have three wires coming from boiler and the thermostat receiver talks about needing 4 wires. What do I do? This is what the thermostat instructions say... For conventional heating installations, connections...
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