I moved into a rental home and the thermostat is operating erratically. When the system is set to Off, the fan runs. When the system is set to heat, it works fine until it's up to temp then cold air continues to blow through the house. I looked at the thermostat wiring and Red is to R. Green is to G. Brown is to W2. White to W1 and Blue is to C. Anyone know if this is correct? I'm thinking perhaps Brown should be connected to Y1 instead of W2. Any help would be appreciated. Thanks