In this HVAC Service Training Video, I explain Step By Step How to Troubleshoot a Refrigerator Compressor that will not Start. I go over the Different Components Found on each Fridge Compressor and How to Test them with a Multimeter to tell if they are Bad! I go over the Diagnosis of the PTC Thermistor, Current Starting Relay, Compressor Overload Protector, Start Capacitor, and TSD Timed Starting Device.
Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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My Paperback:
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Tool List:

Compressor Overload Testing Video
Current Starting Relay Video
PTC Thermistor Video
Common Relays Video
Potential Relay Video
Compressor Common, Start, Run Taps Video

Here are some of the Tools I use:
Yellow Jacket Refrigerant Gauge Set
Refrigerant hoses with valves
Yellow Jacket Gauge set & hoses
Yellow Jacket 4 Port Manifold w Hoses
FieldpieceSMAN360 Digital Manifold Set
FieldpieceSMAN460 Digital Manifold Set
Compact Ball Valve for Refrigerant Hose
QuickDisconnect 90 for refrigerant hose
UEI DL479 Multimeter with temp sensor
JB 6 CFM Vacuum Pump
Appion Blue 3/8″ to 1/4″ Vacuum Hose
Appion Red 3/8″ to 1/4″ Vacuum Hose
Appion Valve Core Removal Tool
Yellow Jacket 1/4″ by 1/4″ hose
CPS Vacuum Micron Gauge
Supco Vacuum Micron Gauge
RectorSeal Bubble Gas Leak Detector
UEI DL389 Multimeter
Fieldpiece ST4 Dual Temp Meter
Air Acetylene Torch setup
15% Silver Brazing Rods
Nitrogen Regulator
Nitrogen Flow Meter
Digital Refrigerant Scale
Accutrak VPE Ultrasonic Leak Detector
Imperial Kwik Charge 535-C
FieldpieceSDMN6 Dual Manometer Pump
Supco Magnet Jumpers
2 pairs of alligator clips-
JB Vacuum Pump Oil
General Tools digital Psychrometer
Fieldpiece SDP2 Digital Psychrometer
Ratcheting Service Wrench
Appion G5 Twin Recovery Pump
Irwin Wire Stripper/Cutter/Crimper

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22 thoughts on “Refrigerator Compressor Not Running? Test The Start Relay, Overload, Capacitor, PTC Thermistor

  1. AC Service Tech LLC says:

    The E-Book and Paperback at our Website: https://www.acservicetech.com/the-book

    The Paperback at Amazon: https://www.amazon.com/shop/acservicetech

    Support the Channel- https://www.patreon.com/acservicetech

    Tool List- https://www.amazon.com/shop/acservicetech

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  2. souha chalhoub says:

    Hi, the capacitor wires should be both placed in one side on the relay (where there is 2 pins) and the white wire (i guess the neuter wire) in the other side from the relay (where there is 1 pin)? Please advise it is an old whirlpool fridge thank u so much in advance 4 ur reply 🙏

  3. kalamelliel says:

    Hi, I have True refrigerator model GDM-12, and it’s running cold, the thermostat is not controlling the temperature. I did check the thermostat and it has continuity. Do you know what else could be the problem?

  4. V T says:

    I tested the new purchased combo start relay. I did a continuity test. One terminal has the continuity. The other terminal doesn't. Is the relay that I purchased a defect? Please advise. Thanks.

  5. Raymond Nasto says:

    Thank you for posting this very informative video,,,My question to you is what caused the compressor in my wine fridge to stop running and get very hot,,,Initially it stopped working and I replaced the overload protector(6750c-0004r) and start/run relay(PTC starter relay( P6R8MC) ,that didn't solve the problem so upon testing the thermostat I found it bad,so I got it to run after replacing the thermostat(18GLB020008) and that's when after running for awhile the compressor got very hot and I noticed a strange smell.,,I'm wondering if maybe it developed a refrigerant leak after moving things around like the condenser /evaporator,Thanks in advance

  6. V T says:

    Hi guys. My bottom freezer refrigerator is about 8 years old and having the cold problem, freezer is not cold at all. I see frost at the joint between the small callipary tube and the evaporator tube. Then It melted, water started dripping. The temperature was between 28-48F. I did reset the fridge by unplugged/plugged. It didn't make any different. I did replace the start relay, capacitor, defrost thermostat, temperature sensor, and electric control board, still does not work. Is it worth to repair my fridge? And how much does it usually cost for vacuum/flush out moisture/oil out of the refrigeration, including replacing the drier filter? Please advise. Thank you.

  7. Clint Richardson says:

    Mine just has the start relay with the PTC disk in the middle that plugs directly on to the 3 prongs from the compressor. There is no visible overload or additional component attached. The fridge stopped cooling and the compressor doesnt go on but I hear the intermittent clicks.

    I took apart the housing of the start relay and the PTC disk is intact. It doesnt seem to be dirty, so I rotated the disk and tightened up the prongs holding it in place and put it back on but its still clicking and not wanting to start.

    Im planning to get a new start relay but wondering what else might be the problem or common and cheap enough to pick up with a new relay.

  8. Chris Goulet says:

    You did NOT show how to test a current relay that uses a start capacitor. On this type of current relay, the switching contacts are across the Start socket and a terminal on the side (labeled '1' on the type that I tested). You showed how to test a current relay that does NOT use a start capacitor, which has the contacts across the Start and Run sockets. I got confused about these different designs, until I found a schematic: https://image.indotrading.com/co60115/pdf/p647913/4440y%201sr.pdf

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