Upon AC diagnostic, return to find that low-voltage wiring was once again disconnected due to rodent pulling wiring back into wall. Upon further investigation customer complain that indoor fan would not turn off, After applying force to fan relay the circuit had opened and fan stopped running although relay is no longer functional. Recommended running new low-voltage wiring throughout home back to condenser in conduit for protection against rodent so they may not chew up. Also must replace fan relay to get fan working again.