Complete: 4 systems worked on Main. Carrrier split HP: HO said the unit wasn’t cooling properly and the Tstat didn’t have a display. He pulled tstat off and accidentally touched two wires together. At the AH found 5amp fuse blown. Replaced fuse system came on except condenser. Found 2pole contactor bad replaces contactor and unit came on. Checked charge system working great at this time. While under home found Skuttle air purifier not working. Suggested PureAirx FM1-12. Going to talk to husband. She wrote down Info.