Arrived today due to 2014 Carrier(unit #6) which is responsible for the main office.Upon arrival thermostat was at 77° with a desired temperature of 71° confirming the indoor & outdoor equipment was non-operational.Once operation was determined began diagnostic on the indoor equipment removed cover to equipment testing for power not having any voltage went to breaker finding it to be tripped in multiple areas of the facility.Reset breaker which regained functionality to indoor & outdoor equipment.Once operation was regained began diagnostic on the indoor equipment the filter 16x20x1 was not discolored or clogged the filter wasn’t replaced on this visit.Confirmed voltage was proper going to equipment equipment along with tested transformer confirming it was in specifications.Low voltage fuse was not blown and no safeties were tripped.Blower motor was fully operational not showing any signs of being intermittent or dropping out.Blower wheel was inspected finding it to be dirty when a blo