A beauty shop owner calls to say that the unit serving the shop is blowing cool air from time to time. This is a split system with the outdoor unit on the roof. When the technician turns the thermostat to the first stage of heat, cool air comes out of the air registers. The technician goes to the outdoor unit—the outdoor fan is running, but the compressor is not. Safety Precaution: The power is turned off. The panel is locked and tagged before the technician removes the cover to the compressor compartment. An ohm check shows that there is an open circuit between the R and C terminals and between the S and C terminals, but there is continuity between R and S. The compressor body temperature is warm, not hot.