I have a Trane Heat Pump and I noticed that the auxillary light that use to be blue, when it came on, now it is green. When the heat pump comes on, the outside unit fan will run for a little while and then, when the auxillary light now green comes on the fan will turn off. It has a Trane Baystat 240 weatherton heat pump thermostat on it now. I was going to change it to a Honeywell RTHL3550, but there are too many wires for this one. What is causing the auxillary light to change colors? It use to be blue, now green. Is it the thermostat or something else?