Upon my arrival I evaluated 2 carrier heat pump systems. I verified system safety and performance is to manufacture specifications. Flushed and treated the water removal system. Cleaned the electrical cabinet and washed unit using water. Found the voltage enhancement system for unit #2 to be faulty on the herm side. Informed customer of fault and presented options for repair. Customer chose the HN13A option. I replaced the voltage enhancement system and did safety and performance testing and found unit to be running at manufacturers specifications at this time. No other recommendations at this time. WO-TNFR559097