When the two ohmmeter probes touch any two compressor terminals, the meter should register an ohm reading. Otherwise, the compressor is defective and it must be replaced. When the ohmmeter probes touch a single terminal and the housing (ground), the meter should register a no-continuity reading (an open circuit, an infinity reading, a figure 8 on the meter lying on its side); otherwise, the compressor is shorted and it must be replaced. (Scratch or sand the paint off a small spot on the compressor housing to get a good contact.)
1. Disconnect the unit from the power source.
2. Remove the compressor terminal cover.
3. Remove the overload protector and starting relay from the three compressor terminals. (See fig. 12.)
4. Set the ohmmeter on its RX1 scale and zero it.
5. Touch the probes to the compressor C and S terminals. The meter should register a continuity reading. Otherwise, replace the compressor.
6. Touch the probes to the compressor C and R terminals to get a continuity reading. Otherwise, replace the compressor.
7. Touch the probes to the compressor S and R terminals to get a continuity reading. If not, the compressor is defective.
8. Touch one probe to the compressor housing and the other one to each terminal in turn. In each case, the meter should register no-continuity reading.
Otherwise, replace the compressor.
