Arrived today due to 2013 Carrier not heating/cooling which is responsible for the entire house.Upon arrival thermostat was at 75° with a desired temperature of 74° on the main level & the upstairs thermostat was blank determined due to corroded batteries it has damaged the thermostat causing intermittent power to be supplied which makes thermostat intermittently power on and off a quote has been provided to replace thermostat.Tested functionality of equipment in cool/heat function confirming its ability to complete instructed functions but equipment was displaying an abnormal noise along with no airflow was being disturb through duct-work.Once finished with determining the operation went into attic finding furnace & zone board to be blank indicating power has been lost.Light switch was in the on position tested for voltage confirming no power was present went to the breaker finding breaker tripped indicating a high voltage issue.Reset breaker to the furnace regaining power to furnace