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winding in the compressor, you will use the Ohmmeter and attach 1 probe to T1 and the other probe to T2. If the Ohmmeter reads 0.L or infinity then there is an open winding. If the compressor is in thermal overload this may cause there to be an open winding between terminals and hence read 0.L or infinity. Wait for the compressor to cool down properly before testing again. Test between all terminals. If an open winding is found after the compressor is out of thermal overload, then it needs replacement.

Checking for Internal Short- Repeat the steps of checking for an open winding. In a 3 phase compressor, each Ohm reading from terminal to terminal should essentially be the same. For example, if you had an Ohm reading of 2 between T1 and T3, then you should have an Ohm reading of 2 between T2 and T3. So, you should get the same Ohm reading, approximately, across all terminals. If there is a significant difference in the readings then there may be a short in the compressor windings.

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