There are 6 wires when I took off my old thermostat - 1 green, 1 yellow, 1 white, 1 blue, 1 red and 1 black. The thermostat I bought is the Uberhaus th3200 and it takes only 5 wires. I connected all the 5 wires as instructed but left the black one capped. The system runs but the fan does not turn off. Any help with where the balck wire should go?