Reinstall original time delay relay and defrost control board Replace coil temp sensor and replace outdoor ambient temp sensor Reinstall compressor start capacitor circuit Inspect and test system in heating mode Inspect all equipment in the basement for good connections and proper operation in heat pump and gas furnace mode Test and inspect high voltage circuit at 123 VAC all connections at the furnace secure and snug Replace Honeywell t6 sub base with fresh wire connections Disable humidifier circuit for testing Scroll through and perform minor adjustments to thermostat ISU Possible incorrect setting on ISU step 356 set to 50 Homeowner will test as the temperatures drop and report to the office