Quick Question! I came to turn on heat and the heatpump
only blows out cool air. Emergency heat does operate okay. Unit was working fine this morning when I left for work. Has been working well up to now. The temperature went into the low 60s today. My wife turned on the air for a while. What could be the deal? What could make a heat pump not produce heat other than low freon, leak, stuck reversing valve, frozen coil,etc. I have a 4 ton Trane Xl41i R-22 heat pump with TWE065E airhandler. I want some idea before the tech is called on Monday. I have turned off the breakers for awhile, then turned back on.