Upon arrival the low voltage fuse was blown. I installed a temporary breaker and tested. I found several places in stat wire at condenser, the outside coating was off. I repaired all the bad places in wire. I tested again but still tripped breaker. I inspected contactor and found it burnt on low voltage coil. I replaced contactor. Then tested again and system will cool or heat at this time. I tried calling homeowner several times but bad connection.