Today I arrived to club members property for error code EF1.COF. Mr Gaylloyd explained to me that he replaced his Trane thermostat with and Honeywell thermostat. I noticed common and blower thermostat wire was exposed also touching. I explained to Mr Gaylloyd about wires touching can cause faulty codes. I fixed wires and reset the furnace for 15 minutes and code was cleared. Also I replaced contactor due to bad coils on the side. I tested the contactor and received 1.0 on the side. Rewired the low voltage wires outside at the condenser unit because they was loose. Now system is working properly now.