If the start relay is defective, the compressor will find it hard to run or may not run at all. Insert one of the probe test leads into the common voltage pin connector and the other into one of the winding pin connectors. If the wire lacks continuity, it has a "short." With motor current flowing, the TEST button can be used to check whether the relay is working correctly (device/solid-state TEST). Check the Start Relay. Lots of people searching now a day to buy electronic components store but very few are able to find a good one. Then connect the Red and Black probe of the multimeter to the coil of the relay: Along with it, NO and COM contacts must show 0 Ω, which means it is open-circuited when no input is given. First of all take the relay and search that particular relay on the internet you will find the datasheet of that particular relay. Under normal circumstances, you should get a “closed” reading across the contact. Use a multimeter to measure resistance across all the pairs of the connectors on the underside of the PTC relay. The first method of checking the terminal resistance was useful when you have datasheet available, and another method was also useful when you are making a project based on a relay or you do not have any datasheet available then you can use that method. Then see the relay and find out which one terminal is common, start and run. In the measurement of NO contact there should be the resistance of MΩ, if you find the value of MΩs then this NC terminal is working fine, and the reason behind this is that when NC and COM are not connected there is a huge amount of impendence. Typically, this will be the 200ohms setting on your multimeter. The polarity of probes on terminals doesn’t matter because we are finding resistance. When a relay is not working, then the meter will read zero or OL. Step 1: With the relay in any position, check if there is continuity between terminals 1 and 2 of the relay. You will find the resistance of the relay coil. Set the multimeter in continuity test mode. 11-07-2008, 02:08 PM #3 Circuits usually have fuses or breakers that automatically cut off current flow … A relay is defined as an electrically controlled device that opens and closes electrical contacts with help of electromagnetic switching, and performs ON and OFF operation of other devices in the electrical circuit. Step1: Connect the two probe of multimeter to the coil terminals ( C1 & C2) as shown. Remove both wires from the thermal overload protector. The main reason for testing a relay is to find, whether it is a good or defective one. Using a multimeter. You should see or hear the continuity indicator from the meter. Set the dial on your multimeter at the lowest ohms of resistance (ohms will have this symbol on it: Ω). If the multimeter has multiple ranges within the ohm setting, choose the lowest range possible to get the most accurate reading. Then see the relay and find our that which one terminal is common, start and run. If your water seems to be too hot to the point of boiling, then it means your thermostat is broken instead whi… Only one pair should give you a reading - it should be between 10 - 100 ohms. However, if this rubber label is not available or removed then follow the below steps. A diode is like a one-way valve that only allows power circulation in one direction. In conclusion, the relay is an “electromagnetic switch” for controlling high current devices with the low current circuit. Overload relay can be defined as a specific type of protection device, which is used in the circuits of a refrigerator compressor. Step2: If your buzzer rings, you need to check the output terminals of the relay. From this image check the similar match relay. 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