Found breaker to heating strips turned off. System has 15kw heat kit but there is only one set of 240 and is using only 10kw. I traced the wires during a call for the heat pump. I found that when the Y wire gets plugged into the defrost board it drops the 24v. This indicates the board is shorted and causing a voltage drop. Plus, it has a big burn spot due to an ant. System is heating using the aux heat and rose the temp 4 degrees before leaving.