Heat Pump Electrical Sequences Explained – Fix It with the Schematic
This video breaks down how to troubleshoot a conventional heat pump by following the schematic through every operating mode—cooling, heating, defrost, and emergency heat.
Learn how each component is energized, what to expect during each mode, and how to diagnose common failures using real-world logic and wiring sequences.
Understanding the electrical behavior of a heat pump is crucial for HVAC technicians who want to stop guessing and start fixing.
📌 Covers:
– Reversing valve behavior
– Defrost cycle wiring
– Emergency heat vs auxiliary
– Real diagnostic mindset
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00:00 Thermostat, AH & CU External Wiring
02:13 CU/Defrost Control Board Cooling Mode
04:44 CU High Voltage Circuits
06:11 Low Voltage System Heating Mode
06:57 Defrost Cycles
12:45 Auxiliary & Emergency Heat