Arrive to do a checkup. Systems evaporator coil was enveloped in a block of ice. Deice the system, and cleaned the unit.. added refrigerant due to suspicion of low charge. Discovered system was not low so recovered refrigerant. Discovered wiring issue and tried to amend it. Still having trouble so called tech 468 out to help. 468 helped me get the system cooling. Still needs further diagnosing. Put in reschedule form for 468 and 477 to come back Thursday afternoon to continue diagnostics.