how to check refrigerator compressor relay

Return the player and place a probe from terminal s to terminal L. Test the continuity of the refrigerator's various components. If the fans are running and your compressor won’t start or if you hear a clicking sound from the unit, check the overload relay for signs of overheating or arcing. Use an ohmmeter set on the lowest scale to check the relay from the two terminals on the front of the case. Use a flathead screwdriver to remove the one or two screws that are holding the panel on. The start relay is usually mounted to the compressor; it helps kickstart the compressor during the cooling cycle. It specifically produces a clicking noise whenever it tells the compressor to start working. Refrigerator compressor clicks on and off. In the third case, it is the opposite, if there is continuity, there is a problem and the relay needs to be replaced. The refrigerator relay usually works pretty covertly, but it does tend to produce a sound. Here’s a bunch of other refrigerator repair tips. Unplug the refrigerator. In the first two checks, if there is no continuity, it is necessary to change the relay. To check if the relay has continuity, place the two probes of the tester on the two terminals S and M. The reading should be zero. You have to unplug the part from the compressor. If the compressor is clicking on and off, or worse, not running at all, check the start relay. Here’s the thing though: That clicking noise will still pop up even if the relay system is busted. A start relay is an electrical switch which tells the compressor when to turn on or off depending on the requirement of cool air inside the unit. Here we show you how to test you relay on the compressor and for a short in the compressor when the compressor won't come on … Faulty start relay (less likely) If the relay is bad, signals from the thermostat won’t get to the compressor and fan. Another fundamental and simple check is related to the state of the main and auxiliary coils of the compressor. After checking the 3 windings combination, you should also check each terminal to chasis. If the relay fails, the compressor might not ever turn on! A refrigerator that makes a buzzing or humming sound but doesn’t keep the food cold may have: A blown compressor (big bucks); Or just a bad overload or compressor relay (much cheaper). Remove the relay/overload and look at the three pins on the compressor. Step by step instructions on how to replace a Compressor Start Relay for LG LFX25971ST Won't start #AP5949339 for Refrigerator made by Kenmore, LG. You can check the serviceability of the compressor of the refrigerator initially by 3 basic parameters. The meter should indicate a resistance of between 3 and 26 ohms. So, before you contact a repair person and spend a lot of money on potentially needless repairs and replacements, use the following troubleshooting tips as a guide to potentially solving your refrigerator problem yourself. If the start relay is faulty, you may hear clicking as the compressor turns on and off intermittently. The reading obtained between the Run and Common and the Start and Frequent hooks must be included. Attach the start relay to the compressor at the same point, replace the back panel, and plug the refrigerator back in. Now, it will act as an indicator of if the compressor indeed requires a replacement. Check the Start Relay. On the ideal side of the compressor, you should see a box with wires coming from it. Now, in case the relay fails or burns out, the compressor may fail to kick in, meaning the interior of the cabinet will fail to freeze. The cable is used to bring the start winding in the circuit before the compressor reaches running speed. If you shake the relay but there is no rattle, chances are fairly good that the relay is good, but your compressor is bad. First of all off the refrigerator and plug out the refrigerator supply plug from the outlet, or switch off the double pole circuit breaker from which the refrigerator supply plug controlled. Fridge compressor running but not cooling. Relay is an electrical switch that tells your compressor to turn on or off depending on the temperature inside the unit. Power is applied to the compressor motor windings throughout the overload apparatus. If the refrigerator start relay is burned out, then the compressor may not work and the interior will not freeze. Enter the multi-test with a probe on each two terminals s and m. Set or try to zero ohms. If it does not stop the clicking sound, there’s one more thing you can check: The condenser fan. You can with ease find them in the normal fridge. It tells the compressor when to turn on/off, depending on the need for cool air inside the refrigerator unit. In other words, a test by the tester is carried out to examine the winding, in order to detect its damage. If it rattles, this relay is bad and can be replaced for about $20. Continued from page 1. Step by step instructions on how to replace a Compressor Start Relay for LG LFX25971ST Won't start #AP5949339 for Refrigerator made by Kenmore, LG. Here we show you how to test you relay on the compressor and for a short in the compressor when the compressor won't come on but everything else is running. It is responsible for powering the start winding for a brief moment to help start up the fridge compressor motor. It should make a thunka thunka type noise because it has a sliding start switch mount within it. Test a Refrigerator PTC Relay A PTC (Positive Temperature Coefficient) relay is a starting device for fridge compressors. This will require using a multimeter on several of the refrigerator's components. Then start looking for the starter relay switch. Also, if the compressor uses a capacitor, it must be discharged first to avoid the risk of electrical shock. This is a video showing you how to install a 3 in 1 start relay. Note: This video is intended to give you the general idea of the part replacement procedure. The compressor relay can be accessed by removing the terminal cover box. The relationship between the refrigerator relay and compressor is a vital one … Important Safety Measures-. When the refrigerator compressor is on and off and not run properly. If the relay stops working, the compressor will also stop. The issue may be the compressor relay, which starts the compressor, or another easier (and cheaper) part to fix. Check the working parameters of the refrigerator compressor, but this requires some knowledge. Mostly this cause happens when the compressor is overloaded. A fault in any one of these components can cause the refrigerator to cycle improperly. For those with the guts and determination, here is how to test your refrigerator's compressor relay.Before working on your refrigerator, always unplug the unit or turn off the circuit breaker that powers it.Locate the compressor. Before testing a compressor relay, unplug the refrigerator to avoid an electrical shock hazard. There will be primary lines that are represented by L1, L2, L3, etc. How To Test A Refrigerator Compressor Relay? Step 1; Before working on your fridge, always unplug the device or switch off the circuit breaker that powers it. A start relay is an electrical switch that helps boost the compressor inside the refrigerator. Refrigerator compressor trouble shooting: The usual suspects 1. How To Test the Compressor Relay. You Have To Shake The Switch. There is a temperature sensor in the refrigerator’s chamber, as soon as the temperature in the chamber begins to rise, it sends a signal to the relay… Remove the panel. 5. How do you check the compressor relay on a refrigerator? Hold the relay in your hand, and give it a bit of a shake. If your fridge compressor runs but will not cool your food, the culprit often turns out to be the fans- either in the evaporator or the condenser- or the evaporator coils. When a compressor is bad, the repairs can cost more than what a new appliance would. The solid state relays can be easily tested by removing it from the compressor and shaking it. Before seeking expert help, consider following our guide so you can make your own assessment find out whether your refrigerator compressor is broken. Find the panel on the side of the compressor. The compressor relay will go bad over time. For very small class capillary system refrigerator, usually a bar fridge or … (fried) If it sounds like a salt shaker and tiny bits of stuff is coming out of it then it is bad. A refrigerator start relay is a device that jump-starts the compressor inside the refrigerator. 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