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Customer Questions and Answers for Overload (Compressor Thermal Protector) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18027975
Manufacturer Part Number: WP4387938

This compressor overload is a thermal protector that opens the circuit if the compressor overheats or draws excessive current. Replacing a failed overload restores reliable starts and helps prevent compressor damage when your refrigerator won't cool.

  • Protects the compressor by interrupting power during overheat/overcurrent conditions
  • Common symptoms: refrigerator not cooling, compressor won't start, repeated clicking or brief hum then shutoff
  • Mounts on the compressor terminal and works alongside the start relay on applicable models
  • Built for proper fit and dependable operation in the start circuit
What's included: One overload protector
  • Unplug the refrigerator and remove the rear access panel to reach the compressor
  • Note wire positions; pull the old overload straight off the compressor pin
  • Push the new overload fully onto the correct terminal and reconnect wiring/terminal cover
  • Restore power and verify the compressor starts without repeated clicking

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$98.61
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Questions & Answers

For Whirlpool Overload (Compressor Thermal Protector) (Part Number: OEM18027975)

1 Answer

Hello Penny, This is not a hard job at all. Just be sure to place each wire on the new part as soon as it is removed from the old part so the wires are placed in the correct positions. Other than that, the hardest part will be removing the cover. It snaps on pretty tight and you will have to use a screwdriver to pry it off.

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1 Answer

Hello Greg, I'm sorry but we need you to locate the units' I.D. tag and please provide the model number so we can look up the correct part for your unit and the wiring diagram so we can accurately provide installation instructions for your part. Thank you for your patience and understanding in this matter.

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Min for Model Number Fisher Scientific Cat:13-986-106A Model : ET18NK

This is a Lab used refrigerator. Both freezer and frig are warm, I can hear compressor pretty often start and stop in 5-10 sec with clicking sound. I did study know the problem is "capacitor". But I looked around compressor , didn't find it. So, I just took the only part by the compressor, it is overload. I ordered the exactly overload from Pros, changed it. Now I still have Warm problem, compressor still start 5-10 sec then stop. I still believe it is capacitor problem, but I can't find where capacitor is. Please advise! Thanks!

1 Answer

Hello Min. We do not offer parts for this brand. You can try a 3 in 1 TJ90RCO410 on the unit, but if the compressor still does not run, then the compressor is bad.

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1 Answer

Hello Marc. No, if the condenser is to hot, you will need to check the condenser fan motor WP2188874 in the unit. The relay and overload are only for the compressor.

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Dennis A for Model Number ET8MHKXMQ04

This Whirlpool Refrig is 7 years old.I am somewhat familar with the workings of a refrigerator. Every 6 months I clean the condenser and compressor area. The unit is clean now. The refrig is coolong fine. Around 38 degrees in refrig and aout 10 degrees in the freezer. The frig is not overloaded with food items. Lately when the compressor and fans activate, all will run for around 15 to 20 minutes the shut off..Around 2 minutes later the compressor and fans will acivate again for about 1 minute the shut off Again after about a minute the compressor and fans will activate for about a minute the shut off. This will happen for about 6 to 7 times. Then the unit will be off for a while( about 20 to 30 minutes. Then the compressor and fans will activate and run for about 15 to 20 minutes and the short cycles will start again. On occasion I have heard a thump/clunk from the compressor. The compressor doesn't feel that hot. I can hold my hand on it. The compressor cooling fan is working fine. Any ideas on what can be the problem? Any advice will be greatly appreciated. Thanks Dennis

1 Answer

Dennis, You will want to check for loose wiring, if the wiring checks ok then this would sound like a faulty thermostat.

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1 Answer

Hello Dave, Sometimes there will be a wire retainer and if it has been serviced before, there may be a wire tie holding it on the compressor. Remove which ever it has and with the unit unplugged, slip a flat bladed screwdriver between the start device and the compressor. You will be able to carefully slip it off.

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1 Answer

Hello Tom. See if the compressor stops running. If so, it sounds like the thermostat WP2200859 is bad and will need to be replaced in the unit.

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1 Answer

Hi Ray. Use a volt/ohm meter part # MA-DM1 to assist you in your diagnostics. Use the R x 1 scale and put the 2 meter leads together momentarily to verify the meters ohm scale is working. You normally read .01 or .02 ohms resistance in the leads itself - normal. This tells you the meters 9v battery is good. If you are hearing a heavy "Click" every few seconds then either the overload is bad or the compressor windings are bad. After you remove the overload and let it cool completely, it should read approx. 4-6 ohms cold. If it rattles as well then the ptc disk inside is bad. Overload part # WP4387938. Thank you.

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Craig K. for Model Number 106.60832101

Follow up question: Still having difficulty seeing how these parts will replace the original overload and capacitor. I do not see how the original capacitor can mount on these parts. My compressor has three prongs in a triangular pattern and I think I see how my replacement parts (AP3136048) mount on those and the harness connector fits smaller spades so I am assuming I need to replace those. But what about the capacitor? Is there a different capacitor that I need? Any help would be appreciated.

1 Answer

Hi Craig. The overload has a single female round pin that slides onto the "top" of the triangle set of pins. Then this will leave the left over 2- remaining compressor pins side by side , correct? This is where the relay female pins slide onto the compressor. Together these 2 parts will cover all 3-triangular pins. Then Yes, use the smaller spade jumper wire to extend the wire to the relay. The capacitor is part # WPW10662129. Some models have them while others do not(lesser Quality). It is a run capacitor and in my opinion will keep the compressor running smoother and longer. SO you simply need to use the 2 capacitor wires and connect them to the relay by choosing the terminals #1 and what is across from it and not below it. Thank You.

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