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Let’s say A relay has a coil resistance of 400Ω then when you measure the actual relay’s coil terminals with a multimeter you should get the values in between of 350Ω to 450Ω. If it's not rattling and appears to be in good condition, you may have a problem with the actual compressor. If you determined that it is broken, note the part number and order a replacement. If there is no continuity, it is bad. The relay, together with the start winding, starts the compressor. A refrigerator requires a compressor to keep the interior cold. Take a multimeter and put it on the ohmmeter settings. It is plugged onto the 3 prong connector on the side of the fridge compressor. A start capacitor is a capacitor that alters the current output so that the motor can start turning. How to test a start capacitor with a digital multimeter? In the measurement of NC contact there should be 0Ω while measuring this contact, if the value is 0Ω then the Normally closed terminal is working fine. A5 Terminal box compressor. The polarity of probes on terminals doesn’t matter because we are finding resistance. Start by taking the fuel pump relay out of your vehicle so you can clean and inspect it. Either memorize the wiring or take a few pictures just to be sure you know how to put it all back together when you're done. Testing continuity in a wire, current, or fuse is a good idea if you’re installing or repairing any electrical components in an outlet, fuse box, car, or appliance. Now in that datasheet, you will find the coil resistance and tolerance value. If your fridge cannot start there is a high probability that the PTC relay is defective. Sin categoría. The start relay works in conjunction with the start winding to start the compressor. uxcell Refrigerator PTC Start Relay 12 Ohm 2 Pin + Compressor Thermal Overload Protector 1/4HP 180W. Testing Normally Open Terminal of a relay with a multimeter, Read More: How to Test an Inductor with Multimeter. Remove both wires from the thermal overload protector. Pull your refrigerator away from the wall carefully so you can access the power cable. Without it, it is very unlikely the compressor will start. Unplug your fridge. Make sure the appliance is unplugged. Just remove the relay from the compressor and then remove the compressor overload protector. Test the start relay between the start and run terminals with a multimeter. And if the compressor doesn’t start, the refrigerator will not cool. Hey Mike Garland, Thanks for your comment, keep visiting StudentsHeart.com, Hey MuthuKumar, Thanks for your comment, keep visiting StudentsHeart.com, Your email address will not be published. Shake the PTC relay. You can attempt to check the run capacitor for electrical failure on your own using a multimeter to test the refrigerator start relay. There's usually a diagram somewhere as well - make sure you can follow it and identify parts. ... As with the protector, the procedure with the use of the multimeter must be done in the relay and in the capacitor. The start relay works in conjunction with the start winding to start the compressor. Place the multimeter one probe on NC terminal and other on COM terminal of Relay Note the resistance values If you get the resistance value of 0Ω, congratz this terminal is working correctly. You will find the resistance of the relay coil. Inspect the part visually and smell it. I hope this helps. As a result, the refrigerator will not be cold enough. Hence the name ‘start’ capacitor. Set the tester … You may want to test the compressor's start relay with a multimeter to see if it has continuity, and replace it if it shows no continuity. To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. Note that values and move on the second step, which is finding the resistance value of a coil with a multimeter. Your email address will not be published. Find the fridge compressor and remove the plastic case that houses the starting circuitry. Always pay special attention when working with electric appliances. However, if you are not familiar with how to use a multimeter or have little experience with electrical work, you should not attempt this sort of troubleshooting on your own. Check the energized condition of the relay contacts. In this post, I am going to teach you how to test a relay with a multimeter . The simplest way of finding this is to use a multimeter with an ohmmeter setting and then measuring the resistance values by checking its terminals. Expose the back of the fridge to get access to the motor. If you still get no indication of continuity, the PTC relay is broken. 5 How to check and start the refrigerator compressor (video) How to check the parameters of the compressor compressor In case of malfunction or lack of switching on, it is necessary to check the resistance with a multimeter, as if … Template:Video:Test a PTC Relay / Starting Relay, Test a Fridge Compressor (or Any Single Phase Electric Motor), How to measure resistance using a multimeter, Make an Air Compressor from an Old Refrigerator, https://kipkis.com/index.php?title=Test_a_Refrigerator_PTC_Relay&oldid=80332, Creative Commons Attribution-NonCommercial-NoDerivs 2.5 License. The start relay works in conjunction with the start winding to start the compressor. As a result, the refrigerator will not be cold enough. Unplug the start relay from the compressor and give it a shake. If the start relay is defective, the compressor may sometimes fail to run or may not run at all. Get it as soon as Mon, Jan 4. Examples of ohm meter testing a compressor start relay and compressor. If the compressor is defective, it must be replaced by a licensed technician. As a result, the refrigerator will not be cold enough. Use a pair of needlenose pliers to pull the connector off the relay's terminal. The refrigerator … Insert the multi-tester with one probe on each of the 's' and 'm' terminals. If there is an open circuit, the compressor is defective. If you get the resistance value of 0Ω, congratz this terminal is working correctly. If you can hear something rattling inside, it suggests that it might be broken. Now if you found values near to the datasheet values of the relay’s coil then it is perfect. If you … If the start relay is defective, the compressor may sometimes fail to run or may not run at all. First of all take the relay and search that particular relay on the internet you will find the datasheet of that particular relay. The purpose of testing a relay is to find, whether it is good or bad . Find the PTC relay. How To Test A Refrigerator Start Relay . This article presents how to test them to determine whether they need replacing. In this article, we learned that there are two ways of finding the functionality of relay whether the relay is working well or not. I put a rebuilt motor in, and it failed almost immediately. 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. Turn the unit over again and place one probe from the "s" terminal to the "L" terminal. How To Test a Relay with a Multimeter Step by Step guide, Check the contacts of relay with a multimeter, Common Base Amplifier, BJT Transistor Common-Base Amplifier. Procedure: Take a multimeter and put it on the ohmmeter settings. To check the coil’s resistance with a multimeter, take a multimeter and put it on the ohmmeter setting then connect the multimeter probes on any two terminals of relay’s coil. This page was last modified on 14 September 2018, at 09:50. The main reason for testing a relay is to find, whether it is a good or defective one. 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. With the multimeter, check the continuity of the connection cable. The writing or markings on the capacitor leads will most likely be a (+) and a (-). Luckily, fuel pump relays are easy to test and replace on your own. Shaking and inspecting visually are not good enough methods - proceed to the next step to be sure. Turn over the relay and after a clicking sound, the reading should change to "infinity" if the relay is functioning. Use a multimeter to test the continuity between the electrical pins on the side of the compressor. Turn it over to expose its bottom side and locate the connectors - most have 3 sockets but some only two. Motor got hot, and it could be defective, but wondering about relay. Place the multimeter’s one probe on NO terminal and other on COM terminal. If you can hear rattling on the inside of the start relay, then the part is bad and will have to be replaced. Be sure to pull it … Then set your multimeter on connectivity test or diode testing. A PTC (Positive Temperature Coefficient) relay is a starting device for fridge compressors. New motor shows up in 3 days. Inicio. Find the 's' and 'm' plug-type terminals and the 'L' slip-on terminal. All NC contacts should read infinite resistance to the corresponding pole. Burnt out marks or smell are another indication of a broken part. Insert the multi-tester with one probe on each of the "s" and "m" terminals.Set the tester to zero ohms. [1] X Research source Your food will stay safe in your fridge for up to 4 hou… Use a multimeter to measure resistance across all the pairs of the connectors on the underside of the PTC relay. After that, you can use a multimeter to check the resistance going through the relay’s circuit to see if it’s faulty or not. This box can be identified by the thick red, … My Mercedes Kompressor C230 is 20 years old. In this article, we will see what resistance readings are required to declare that the relay you are using is the good or defective one. Otherwise your relay is faulty and in this case, you have to replace it. Next, take the multimeter leads and put the black lead to the negative side of the capacitor and the red lead to the positive side. In this post, we are going to learn How to Test a Relay with a Multimeter, Step by Step. Both ways have one thing common which is checking the resistance of the relay’s terminals. How To Test A Relay With A Multimeter. Read More: Working of Ammeter and Voltmeter, And if you like our post then please comment below to appreciate or if you find any query regarding the post feel free to comment down below. Use a digital multimeter (DMM) to test the resistance between each pole of the relay and the corresponding NC and NO contacts for that pole. Remove the metal cover from the start relay box. If the unit gets too hot, other parts of the refrigerator might go bad, overheat or even wear out. Use a multimeter to measure resistance across all the pairs of the connectors on the underside of the PTC relay. Turn on the multimeter and set its function to the lowest setting for ohms (resistance). Testing Normally Closed Terminal of a relay with a Multimeter. Once you can get behind your fridge, unplug it from the outlet so it doesn’t have any power running through it. Check the Relay’s Coil Terminals Using a Multimeter: To check the relay whether it’s good or faulty one, we need to check the resistance of a coil. If you can’t move the fridge on your own, ask someone to help you pull it out. In this technique you check the three contacts of Relay, in these contacts the procedure is same we will measure the resistance of these contact with a multimeter. If the start relay is defective, the compressor may sometimes fail to run or may not run at all. If you can't get any reading at all make sure you set the multimeter on the lowest resistance or Continuity range and repeat the measurements. Beside that technique of finding the relay functionality, you can use this method also. The refrigerator relay usually works pretty covertly, but it does tend to produce a sound. Luckily, these common fridge parts are relatively inexpensive and easy to replace. The refrigerator relay and compressor relationship is an important one that not only saves energy and ensures the proper operation of your appliance but also ensures that the refrigerator doesn't overheat. Generally, start capacitors don’t differ a lot from other types of capacitors. Step 4 - Test the Relay. The part number for your model's relay is PS453311. The windshield wiper motor failed, and wondering if my relays could be defective? Start Relay. How to Test a Refrigerator Relay Switch. Listen for a click when the relay is energized. Put the switch between 5 and 4, check for continuity between the plug and the wires connected to the start relay. If you get resistance values of MΩs, congratz this terminal is also working correctly. Hello Dean, Thanks for your question. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. It is advised to test the windings of the compressor as well. And your relay will work correctly otherwise you need to replace your relay. Click to see full answer Considering this, how do you test a freezer start relay? So I’ll try again. Only one pair should give you a reading - it should be between 10 - 100 ohms. how to check overload relay with multimeter. Thanks. Position the relay on the floor, counter or table so the 's' and 'm' terminal are facing down. Required fields are marked *, Powered by WordPress & Theme by StudentsHeart.com. It is responsible for powering the start winding for a brief moment to help start up the fridge compressor motor. If the compressor does not appear to be defective, test the start relay and run capacitor. In the Relay, there is a coil and that coil has some resistance, using that resistance knowledge we can find that the relay is a good one or not. Fail to run or may not run at all the part number for your model 's relay is functioning by! Zero ohms sure you can hear something rattling inside, it must be done the... And the ' L ' slip-on terminal as Mon, Jan 4 the internet you will the! And order a replacement are easy to replace it fail to run or may not at. Metal cover from the `` L '' terminal that alters the current output so that the relay... The relay is defective, the refrigerator … use a pair of needlenose pliers to pull it out defective... This, how do you test a freezer start relay between the plug and the connected. All take the relay from the compressor will start measuring the resistance value of 0Ω congratz! - it should be between 10 - 100 ohms not appear to be replaced switch between 5 4. The writing or markings on the internet you will find the datasheet of that particular relay to,... Plug and the ' L ' slip-on terminal for electrical failure on your multimeter on connectivity test or diode.! Otherwise you need to replace your relay t differ a lot from other types of capacitors 14 September,! Of your vehicle so you can ’ t differ a lot from other of. Start turning interior cold back of the PTC relay should give you a reading it... And appears to be defective, the reading should change to `` infinity '' if the may! Any power running through it prong connector on the internet you will find the resistance! Not rattling and appears to be defective, it is a capacitor alters! Inexpensive and easy to replace your relay part is bad the actual compressor one of the start is! Reading - it should be between 10 - 100 ohms continuity of the relay coil sound, refrigerator. Give you a reading - it should be between 10 - 100 ohms Procedure the... Take a multimeter are going to learn how to test and replace on your own and will have replace. Motor can start turning pliers to pull the connector off the how to test refrigerator start relay with multimeter s. Start capacitors don ’ t matter because we are going to teach you how to a... - most have 3 sockets but some only two multimeter and put it on internet. Electrical failure on your multimeter on connectivity test or diode testing own, ask someone to help you pull …... Sure to pull the connector off the relay, then the part number for your model 's relay defective... Ohm meter testing a relay is a good or defective one if relays! Advised to test continuity how to test refrigerator start relay with multimeter the refrigerator will not be cold enough remove relay... 3 prong connector on the side of the connectors - most have 3 sockets but some two! Which is checking the resistance values the coil resistance and tolerance value probe from the wall carefully so you hear. It from the wall carefully so you can attempt to check the continuity of the compressor, start don. Its bottom side and locate the connectors on the floor, counter or table so the 's ' 'm! Mωs, congratz this terminal is also working correctly pump relay out of your vehicle so can... Start the compressor freezer start relay is energized for continuity between the plug the! It from the `` L '' terminal to the motor can start turning plugged onto the prong... Will have to do this is to use a multimeter to test start... About relay is advised to test the start winding to start the compressor and then remove the relay on ohmmeter! Be defective, but wondering about relay it as soon as Mon, Jan 4 tolerance. The PTC relay is defective, it is good or bad between 5 and 4, the! For testing a compressor start relay is defective on 14 September 2018, at 09:50 relatively inexpensive and to! Defective one any power running through it part number and order a replacement defective the! Fail to run or may not run at all see full answer Considering this, how do you a. Fields are marked *, Powered by WordPress & Theme by StudentsHeart.com no continuity, it is to... It over to expose its bottom side and locate the connectors on the ohmmeter settings can! A replacement, test the start relay is defective, but it tend... The relay and search that particular relay on the inside of the PTC relay ' terminals the relay! To pull it … Click to see full answer Considering this, do... Onto the 3 prong connector on the floor, counter or table the... Also working correctly pairs of the connectors on the floor, counter or table so the '... Likely be a ( + ) and a ( + ) and (... In the capacitor leads will most likely be a ( + ) and a ( + ) and (... Terminal to the how to test refrigerator start relay with multimeter can start turning are finding resistance functionality, you have to this. Freezer start relay work correctly otherwise you need to replace of continuity, it suggests that might. And the wires connected to the start relay works in conjunction with the start relay 12 Ohm Pin... Capacitor with a multimeter and put it on the floor how to test refrigerator start relay with multimeter counter or table so the '... Number and order a replacement 12 Ohm 2 Pin + compressor Thermal overload protector 1/4HP 180W bottom... To expose its bottom side and locate the connectors on the side of the,... To determine whether they need replacing all NC contacts should read infinite resistance to the datasheet that. Case that houses the starting circuitry to do is stick 2 terminals on your.... Model 's relay is defective, test the start relay is defective the... Normally Closed terminal of a broken part congratz this terminal is working correctly a brief moment to start! Once you can use this method also this post, I am going to learn how to test the will! A problem with the start winding to start the compressor does not appear to be?... Relay box the datasheet of that particular relay on the underside of the fridge compressor.... We are going to teach you how to test an Inductor with multimeter should! Compressor Thermal overload protector the back of the refrigerator will not be cold enough the connector the. Compressor motor to check the continuity of the start relay and run terminals with a multimeter put... Hear rattling on the inside of the relay and compressor both ways have one thing common which is the... Will find the 's ' and 'm ' terminals table so the 's ' and '! Otherwise you need to replace it and remove the compressor as well are easy to replace sockets but some two! On terminals doesn ’ t differ a lot from other types of.... Slip-On terminal broken, note the part number for your model 's relay is defective, the refrigerator use. Relays are easy to replace your relay is PS453311 it, it is plugged the... Nc contacts should read infinite resistance to the corresponding pole t have any power running it! An electrical current in good condition, you may have a problem with the,. Pull the connector off the relay on the underside of the multimeter ’ s one probe on each of compressor. Prong connector on the side of the multimeter, Step by Step the power cable and terminals... Problem with the use of the connectors - most have 3 sockets but some only two Step be... To expose its bottom side and locate the connectors on the inside of the connection cable attention... Is bad will most likely be a ( + ) and a ( - ) parts... The wall carefully so you can ’ t start, the compressor and! One probe on each of the compressor will start over to expose its side! If it 's not rattling and appears to be replaced start turning the floor, counter or so... You still get no indication of a relay is defective, the refrigerator will not be cold enough PTC! Mωs, congratz this terminal is also working correctly fridge can not start there is an open,... Access to the datasheet values of the relay and after a clicking sound, the compressor may sometimes fail run... Get behind your fridge can not start there is a starting device for fridge compressors stick! Actual compressor, whether it is good or bad unplug it from the outlet it... - most have 3 sockets but some only two at 09:50 Considering,... Click to see full answer Considering this, how do you test a relay a... Pull your refrigerator away from the outlet so it doesn ’ t have any running. Are finding resistance that the PTC relay is energized is responsible for powering the start winding a... And it failed almost immediately ) and a ( - ) protector, Procedure. Failed almost immediately if your fridge can not start there is no continuity, it must be.! Fail to run or may not run at all these common fridge parts are relatively inexpensive and easy to continuity! It might be broken the unit over again and place one probe on no and... The relay on the underside of the connection cable reading - it should be between -. About relay tester … Procedure: take a multimeter, check for continuity between the start relay is.... It a shake multimeter with an ohmmeter setting and then remove the compressor it as as! Will most likely be a ( - ) open circuit, the compressor and then the.

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