A defective relay will measure zero (0) ohms (shorted) or infinite resistance (open). If you shake the relay but there is no rattle, chances are fairly good that the relay is good, but your compressor is bad. 4. 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. The system is simple. There will be primary lines that are represented by L1, L2, L3, etc. Step 1; Before working on your fridge, always unplug the device or switch off the circuit breaker that powers it. If your fridge cannot start there is a high probability that the PTC relay is defective. If the relay fails, the compressor might not ever turn on! 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. It is responsible for powering the start winding for a brief moment to help start up the fridge compressor motor. The reading obtained between the Run and Common and the Start and Frequent hooks must be included. You have to unplug the part from the compressor. 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. 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. For very small class capillary system refrigerator, usually a bar fridge or … Also, if the compressor uses a capacitor, it must be discharged first to avoid the risk of electrical shock. The compressor turns on and off periodically for an effective cooling process, and for this very reason, a relay is used to assist the compressor while functioning. Then start looking for the starter relay switch. A refrigerator start relay is a device that jump-starts the compressor inside the refrigerator. In the first two checks, if there is no continuity, it is necessary to change the relay. Faulty start relay (less likely) If the relay is bad, signals from the thermostat won’t get to the compressor and fan. If the relay stops working, the compressor will also stop. Magic chef start relay refrigerator dehumidier compressor ptc 68 magic chef lg p6r8mc 1d. It specifically produces a clicking noise whenever it tells the compressor to start working. If it does not stop the clicking sound, there’s one more thing you can check: The condenser fan. When a compressor is bad, the repairs can cost more than what a new appliance would. How to Replace Compressor Start Relay for LG LFX25971ST Won't start #AP5949339. Therefore, knowing how to check the compressor relay of a refrigerator, you can easily repair the device yourself. The start relay is usually mounted to the compressor; it helps kickstart the compressor during the cooling cycle. 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. Attach the start relay to the compressor at the same point, replace the back panel, and plug the refrigerator back in. Continued from page 1. How to check if the refrigerator compressor is broken? 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). Beneath the terminal cover is found the compressor relay (labeled "A" below), overload protector (labeled "B") and the electrical terminals of the compressor motor. When the refrigerator compressor is on and off and not run properly. This is a video showing you how to install a 3 in 1 start relay. 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. Enter the multi-test with a probe on each two terminals s and m. Set or try to zero ohms. (fried) If it sounds like a salt shaker and tiny bits of stuff is coming out of it then it is bad. It tells the compressor when to turn on/off, depending on the need for cool air inside the refrigerator unit. How to test a refrigerator’s overload or relay-start capacitor with a multi-meter: Begin by ensuring you have unplugged your refrigerator, and then remove the rear panel. Return the player and place a probe from terminal s to terminal L. The overload relay is a protection apparatus used at the compressor on your fridge. The meter should indicate a resistance of between 3 and 26 ohms. It means the compressor has a start relay problem. Power is applied to the compressor motor windings throughout the overload apparatus. In the third case, it is the opposite, if there is continuity, there is a problem and the relay needs to be replaced. Another fundamental and simple check is related to the state of the main and auxiliary coils of the compressor. Unplug the refrigerator. If it makes no sound at all it is bad. Here’s the thing though: That clicking noise will still pop up even if the relay system is busted. 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 thermal overload protector is connected or install near with the starting (PTC relay) with compressor terminals. The cable is used to bring the start winding in the circuit before the compressor reaches running speed. 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. Relay to the state of the refrigerator normal fridge compressor motor compressor not explode and. 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