upon arrival found unit not turning on inspected unit for power unit has high-voltage power checked low-voltage power no low-voltage power. checked components that would create low-voltage power found transformer burned up. replace transformer added low-voltage fuse to protect new transformer from burning up. turned system on system turned on and ran for less than five minutes and popped fuse indicating intermittent or high amp short. Performed low-voltage inspection at air handler checked all connections, checked heat strips found no problems at handler. inspected condenser checked low voltage at contactor no problems, low-voltage wiring no problems, checked reversing valve low-voltage no problems. inspected low-voltage wiring in between air handler and condenser found damage underneath line set cover caused by rodents replaced low-voltage wiring Sealed line set cover to help prevent any other rodent damage coming from outside. If rodents exist in at