Verband Deutscher Elektrotechniker (VDE) recently conducted 310,000 tests on Samsung Electronics’ refrigerators over 120 days to assess the performance and durability of its inverter compressors. Carefully disconnect the wires with a pair of pliers, and then remove the relay by pulling it off of the prongs on the compressor. Okay, so let's say the compressor windings check good but it's not running. In fact, this is one of the ways of checking an inverter compressor: making sure that all three windings have the exact same resistance. Read your repair manuals, service and parts updates/bulletins, and specific manufacturer's instructions. If the meter stays at 0 amps, the inverter board is toast-- it's not even trying to start the compressor. Watch This. pack: 1. product sold out. Is this the reason the refrigerator is not cooling? The compressor on your refrigerator is designed to draw a certain current load, and comparing the expected to … Most inverter boards will repeatedly try to power up the compressor. You'll need to backtrack and find the missing voltage. It just shows three wires connected to the CCU. You will need a good ohmmeter that can be measured with one ohms up to 20 kOhm. This is an electrical switch that tells the compressor when to turn on or off depending on the need for cool air inside the unit. Don't try that on these inverter compressors because you'll permanently break it. If the compressor fails to start, the inverter will timeout for 8 minutes and then try again. I checked the compressor and the compressor was room temperature and I realized the compressor was not working. It significantly increases the overall appliance efficiency.. I have run into two f28 whirlpool frontloads in the last two years and applied the technics you mentioned from one of your posts I checked out a while back on F28 errors. Know your limitations! I've explained everything you really need to know in the post. Repair and Replacement of Refrigerator Compressors . Inverter compressors have three windings, not just two like the old skool units. Compared to the traditional single speed compressor, the inverter compressor can run at a number of desired speeds, depending on how the refrigerator is … Unfortunately, there's no way to check this other that by testing the resistance of the three windings, which you did. I was able to barely here it running but it was sounding like it was running. Before you test or work on a capacitor-type refrigerator/freezer, you must discharge the capacitor, or you could receive a severe shock. I replaced the inverter board at this point thinking it was the problem and after installing a new inverter board the refridgerator issue was still the same and the compressor was still not working. Either way I followed your directions to a T and solved both washer issues. so the next step I checked was the compressor and the compressor readings on all 3 pins were 9.6 ohms each so I assumed that the compressor was ok. Many a fine tech has been befuddled by these new compressor systems but not you! 4.6 to 5.4 etc. Check Inverter Refrigerator Compressor: If we working anywhere of inverter Refrigerator Or inverter AC and we want check his Compressor that his Compressor is OK or not, So we should have a PCB kit Because if we turn ON this compressor Direct 220V Volt then this compressor will burned. any thoughts as to where I mis diagnosed the issue. Your refrigerator thermostat is the first thing you want to check when you notice a sudden temperature difference. But if, OTOH, the winding resistances are imbalanced or one of them is open, this is diagnostically conclusive that the compressor … In this video learn about Refrigerator Repair. 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. how many wires should come down to the compressor in this lg system ? not sure about that info. pack: 1. product sold out. I diagnosed a bad tachometer for the motor. We're not in Kansas anymore, boys and girls! If you're working on an inverter compressor system where the compressor isn't running, you can't power an inverter compressor directly to test it. I observed that both evaporator and condensor fans were operating normally. Read your repair manuals, service and parts updates/bulletins, and specific manufacturer's instructions. We have placed cookies on your device to help make this website better. I think if I remember correctly it was the MI3 #2 and #3 pin connections. part no: cmp4j600. It's possible you're dealing with a bad compressor. In the video, the board was already un-mounted from the compressor (around 2:40), but it wasn't shown how to remove it from the side of the compressor.Thanks for posting this, I learned a lot from it! Like it or not, inverter compressors are here to stay. 1/5hp r134 donper domestic compressor. Needless to say it never cooled and at this point I was diagnosing the fridge to have a refrigerant leak some where in the system. I had My 120V coming into the motor control at the MS2 connection The only thing I struggled with at first was not knowing which two of the 3 wires on that MI3 blue wire harness connection, that I was supposed to be getting my measurment from. Once they're up and running, these old skool, compressors run at the same speed and move the same amount of refrigerant vapor per minute. It lets you see at a glance if each phase is present. I checked the J15 connector at the mother board and at the connection going into the inverter board for the out going DC voltage and I was reading a fluctuating DC voltage from 4.2 to 5.6 , 4.5 to 5.4 . If you're a professional Appliantologist and you do this on a service call, you just bought your customer a new refrigerator! You can adjust your cookie settings, otherwise we'll assume you're okay to continue. 2. In this mode, the lights would be on but the compressor won’t run. For this reason, you should learn a systematic method of diagnostics compressor. Check the manufacturer's spec for what that exact resistance reading should be. Refrigerator compressor trouble? I was not getting the 5 volts dc (VCC) coming from the main board up top. According to Repair Clinic, other possible reasons include dirty evaporator coils, a faulty thermostat or a bad evaporator motor (compressor).A loud blowing sound from the motor doesn't mean it's bad either. arrow. Its crazy I dont remember but I always say to myself I will just research it again if another one pops up. Unravel the Mystery of this Simmer Switch Circuit... Sharpen your Schematic Analysis Skills for the New Year. The fluctuating DC voltage on the data line to from the motherboard to the inverter it normal because your meter is actually averaging out the pulse width modulated (PWM) data signal. The refrigerator overload protector testing is very easy using a multi meter, to test your refrigerator thermal overload protector follows the below steps. Now at this point I assumed that the reading was ok because it was in the 4.6 DC range even though the reading was fluctuating up and down on my meter. The same goes for the ice maker and water dispenser. That way, potential customers can see the nice features of the refrigerator, without it running any cooling operation. Check common malfunctions for the make and model of the appliance, including the compressor. - Connect your amp meter around one of the wires supplying 120 VAC to the inverter board (doesn't matter which one). For one thing, inverter compressors use a special three-phase voltage produced by a special control board called an inverter. Usually, the fridge condenser fan and compressor, situated close to the ground on the rear of most refrigerators, came on when the thermostat requires more cooling. If the condenser fan was running normally when the technician plugged it in to check, s/he may want to skip testing the condenser fan. Any body have any thoughts on this issue. Fuggetabout 120 VAC, 60 Hz line voltage. More details on compressor test cords here: http://appliantology.org/blog/1/entry-669-rigging-and-using-a-compressor-test-cord-to-manually-operate-a-compressor/. Are you talking about a linear compressor or a BLDC compressor? The technician will make sure the capacitor is discharged as mentioned above. BTW, the technology used in these variable capacity compressor (VCC) systems is the exact same technology used in front load washers: and inverter board (variously called a "speed control board" or a "motor control unit") that makes a 3-phase voltage to control a special type of motor. and what phases I should be looking for ?? So, inverter compressors, unlike their old skool forebearers, really can work harder. A few of these renowned brands include LG, General Electric, Maytag, Samsung and Whirlpool, which have gained the customer’s trust. So, let's summarize the old skool compressors: - has two windings, a start and a run winding, which are physically different windings and have different resistances; the start winding has higher resistance than the run winding, - runs off standard 120vac household power, - uses a start relay to initially power the start winding and then take it out of the circuit after the compressor is up and running, - can rig up a test cord to directly power the compressor, - are constant capacity and speed machines. Once you look at it in real-life, you'll see. Here's the replacement inverter board I used to fix this refrigerator: http://www.repairclinic.com/PartDetail/Inverter-Board/WR55X11138/2443233. It is not a complete service manual. If you can fix one, you can fix the other. If the compressor windings check good, this is not diagnostically conclusive that the compressor itself is good. - Disconnect the 120 VAC power supply from the inverter board. The compressor is the most important component of a refrigerator, as it regulates the compression and circulation of refrigerant to generate cold air. The perverter board is held on by a single mounting screw that you remove and then lift the board off the compressor retaining flange. Now you have to check the inverter board itself. I did make sure that the cooling system settings were set to the ON position at the dispenser board also. Refrigerator Compressor Testing. fits various makes and models. The compressor of a fridge utilizes a gaseous refrigerant that is in a low-pressure state. Go ahead and loosen the screws, and remove the panel. How to Check Amperage on a Refrigerator. Some use a megger, some a continuity meter, some I am sure make it up as they go along. S/he doesn't want to get any back fed stored current while touching the bare wires, clips and terminals. Thanks for getting back . Before we talk about how these inverter compressors work and and how to troubleshoot them, let's quickly review the old skool compressors so it's fresh in our mind when we compare with how the inverter compressors work. Powered by Invision Community. Hi guys, I have had around 6 different chaps explaining 6 different ways to test a compressor. Your refrigerator's compressor is designed to run sporadically and keep the appliance cool by doing so. Excellent vid, Samurai! Where the normal operating current draw on a conventional compressor is somewhere between 1 and 2 amps, LR current could be somewhere north of 8 amps. Needless to say I stayed calm and took notes from your post on the spec readings and had them handy. One question: how do you remove the inverter board from the compressor? As for the technology, don't be intimidated by it! If the … Pages. If a refrigerator is no longer cooling, there can be several different parts at fault. How would you hook up the phase rotation tester, at he plug on the compressor? Oh, they still do the same basic job-- pump refrigerant vapor. The frequency will vary according to how fast the motherboard wants to the compressor to run. - Reconnect the 120 VAC power supply to the inverter board and watch your amp meter. In their quest to comply with increasingly onerous Energy Star requirements, all the appliance manufacturers are producing refrigerator models that use inverter compressors. It does what it's told by the motherboard. Ensure to turn off the power source to keep yourself safe during the process. But you can (and should!) However, before you make a pricey call to a repair company, some simple DIY troubleshooting can frequently identify the issue with minimal effort.Below, we’ll provide a few simple tips for ensuring your fridge compressor keeps humming along for years to come. To test the PTC relay in your refrigerator, unplug the fridge and remove the lower back panel so you can access the relay, which will look like a small black box with 2 or 3 wires running into it. Please Note: This procedure for testing to see if a … How To Test An Appliance Capacitor With A Multimeter Read More » The three. Everything you need to do your own repairs on all brands of major appliances. These kits come with complete installation instructions. One washer I was nervous about diagnosing it when I got their and dont you know the guy was behind me watching every move I made on top of that. Let's summarize the inverter compressors: - have three windings, not just two; all three windings have the exact same resistance, - does not use a start relay/overload device, - runs off a special voltage produced by an inverter board; the voltage varies in both magnitude and frequency: the higher the frequency, the faster the compressor runs, - cannot directly power the compressor (well, you could but you'd regret it), Troubleshooting Inverter Compressor Systems. Although inverter compressors do the exact same thing as the old skool compressors-- pump refrigerant vapor-- and they physically move the vapor the same way-- through a vapor-compression cycle-- they are powered and controlled very differently. Often, the issue lies with the compressor. 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. To prevent this unhappy scenario, the engineers added an overload device that's used to kill power to the compressor if something goes wrong, like a bad start relay, open compressor start winding, bad internal bearing, or a seized piston inside the compressor that prevents it from starting correctly. Help with repair, fix and replace. The inverter does not need 20 to 25 minutes before it energizes. The tester should read "zero" ohms. How to Test an Evaporator Fan Motor. This is a safety recommendation which must be followed when you are working with parts or equipment driven by electricity. fits various makes and models. I will pick one up as you suggested Samurai. So we should have a PCB kit for Check Inverter Refrigerator Compressor Or Inverter AC Compressor. I am just not sure how to use it. part no: cmp4g600. How to Test a Compressor in a Refrigerator. Let’s get started! The second washer I diagnosed the main control on top was bad. If this goes on for very long, the compressor will literally self destruct (internally) from all the heat. But you can (and should!) Learn how to troubleshoot using schematics like a real tech... MASTER SAMURAI TECH These are inexpensive testers that you can buy here: http://amzn.to/1huTIVJ. Your absolutely correct in not being intimidated by it Samurai. the schematics are not clear which line is the 5 volt dc (vcc) input. fits various makes and models. Now i am thinking that I mis diagnosed the issue and it needs a mother board instead. The idea being that if the problem is just a bad start relay (very common), this can be repaired easily and inexpensively compared to replacing the entire compressor (or refrigerator). They're like voltage checkers but with extra leads for two other voltages (phases). In both cases, the motor has three windings with all the exact same resistance. Based on what you're reporting and the measurements you did, I would have suspected the inverter, too. Then, use a multimeter to check the relay for open resistance. Refrigerator compressor not working - but service guy is telling to fill the gas. Could you tell me how the Phase Rotation tester is used on the inverter to check it. When it comes to choosing refrigerators, people trust famous and well-known brands. Either way, the go-to document for this is the schematic. It is recommended that you call a licensed professional refrigerator repair person for actual testing and repairs. 1/4hp r600 domestic fridge compressor. Remember how a common troubleshooting trick with the old skool compressors is to power it directly with a test cord and see if it starts? The reading on your multimeter will tell you if the capacitor is working properly or needs to be replaced. I heard that also these inverters needed a good 20 to 25 minutes before the would energize the compressor up and run normal after replacing one and that I should try plugging the fridge back in and wait at least 25 minutes to see if the compressor will kick in.
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