Upon my arrival I spoke with the customer about their concerns with the comfort control being blank. I performed my diagnostics finding that the voltage conversion system has failed preventing conversion of high voltage to low voltage. I spoke with the customer about my findings and went over repair options. They approved HD2A today and I performed the approved repair while on site. I installed the new voltage conversion system and redid wire terminals coming to it. I then performed a performance and safety testing followed by the 6 month checked. Flushed and treated the water removal system, washed the condenser coil using water, cleaned and treated the electrical cabinet with electrical insecticide then verified systems safety and performance. Found everything to be operating within manufacture specifications at this time.