How to Determine if a Compressor Starter is Good or Bad?

[HaydenLee]

To determine if a compressor starter is good or bad, follow these methods: 1. Use the resistance range (R1 ohm range) of a multimeter to measure the resistance between the M and S terminals. The reading should be between a few dozen ohms to over twenty ohms. If the resistance is infinite, it indicates damage. 2. Using the same resistance range (R1 ohm range) of a multimeter, place the starter vertically with the coil at the bottom. Insert the red and black probes into the M and S terminals of the starter. The circuit should be open (disconnected); otherwise, it indicates damage. Working principle of the compressor: It draws refrigerant from the low-pressure area, compresses it, and sends it to the high-pressure area for cooling and condensation. The heat is dissipated into the air through the radiator fins, and the refrigerant changes from a gaseous state to a liquid state, increasing its pressure.