Service call for 2nd floor thermostat was blank. Spoke to the customer over the phone and allowed access into the home. The thermosat in the master bedroom was blank. Found that the power switch at the air handler was found on the off position. power was restored and system was checked. Unit is back up and running with no current issues. I was able to speak to the customer again and explained the issue System is operational. https://visionshare.xoi.io/?id=ms0767eb5c-575d-i184-e4ab44cc91ed-uF83-877f77c6ea12