Compressor having a control and diagnostic module

A method comprising:

• measuring a plurality of voltage values of alternating current power supplied to a capacitor, wherein the capacitor is electrically coupled to a compressor;
• measuring a plurality of current values of the alternating current power;
• determining a first power factor value based on at least one of the plurality of voltage values and at least one of the plurality of current values;
• and
• selectively detecting a first capacitor fault in response to concurrent determination that (i) the first power factor value is less than a first power factor threshold and (ii) a first current value of the plurality of current values is greater than a first current threshold, wherein the first capacitor fault indicates that a capacitance of the capacitor has degraded.

A non-transitory computer-readable medium storing instructions executable on a processor, the instructions comprising:

• measuring a plurality of voltage values of alternating current power supplied to a capacitor, wherein the capacitor is electrically coupled to a compressor;
• measuring a plurality of current values of the alternating current power;
• determining a first power factor value based on at least one of the plurality of voltage values and at least one of the plurality of current values;
• and
• selectively detecting a first capacitor fault in response to concurrent determination that (i) the first power factor value is less than a first power factor threshold and (ii) a first current value of the plurality of current values is greater than a first current threshold, wherein the first capacitor fault indicates that a capacitance of the capacitor has degraded.