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Low voltage at compressor!

Getting low voltage at compressor, meter only reads 15 volts at relay, condenser fan runs and evap fan runs,  why are fans get proper voltage and not compressor!!  I am getting proper voltage  going into wire harness but not coming back to compressor!!  checked relay and overload and start cap, all good,  checked compressor with annie, compressor is good, I am just not getting proper voltage to compressor,any idea's   I am stumped,  I do light commercial refrigeration and some household  refrigerators, never had this problem before!!  I do not have wiring diagram to check!!

Posted by lm443 on

  • 1 more comment 
  • Anonymous Mar 13, 2014

    condensor not frozen, all wiring looks good, no line voltage at major timers, switches, and compressor

  • Anonymous Mar 19, 2014

    checking to see if compressor is bad

  • Anonymous Mar 29, 2014

    relay and overload good



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My parts lookup too has no images available for you refrig but i believe it to be a GE Profile with a fresh food fan (and air duct down the center of the fresh food side). All fan motors are 12vdc and run off the Lowvoltage side of motherboard. i assume you are checking voltage to comp from motherboard? How did you check relay?? Have you axcessed motherboard?? On the top of (I say top-- i belive its mounted horiz on yours but all the small wires are on the right) is all the low voltage fan motor, damper, control wiring On the bottom (or the left) side of the motherboard is the larger line voltage wiring. The connector with 3 wires is labeled def -- comp---line it should be blue. Try jumping L1 to comp. ((Just so ya know Def will energize the def heater regardless of compartment temp it does have a bimetal but it only a safety set at 100deg in case relay on board welds shut---it monitor evap compartment, frz, fresh food, (two seperate in FF) in your model))

Posted on Oct 11, 2007

  • don glover
    don glover Jul 25, 2014

    should the condensor fan be on when the compressor is on



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Related Questions:


U-Line ice maker compressor won't run

Dose compressor fell too hot ? There could be several things wrong. First you will need to get out your Volt meter to make all test. With unit calling for freeze cycle the condenser fan and compressor should be running. Check at the compressor to make sure your getting power to the over load switch and then through it to compressor. if not then check to see if compressor is to hot and has the switch open> If so then unplug unit to let compressor cool down so switch will close. when switch closes plug unit back up and start up unit check to see it compressor starts if so then you will need to see what is causing compressor to over heat. could be dirty condenser, low charge, fan dropping out, Bad compressor.


All compressors have a 1) Bi-metal t-stat and Most have 

2) Start-Capacitor assist with 3) Plug-in Start Relay.

 All 3 parts are available at Most Appliance Repair stores and are not that expensive. It is usually 1 of the 3 that has failed.

If your Condenser Fan is Running it is one of the three components or a burnt off wire ... Be Safe.


Good Luck.


Why would evap fan running slow

If u turn the fan by hand and it turn then u need a new fan, and i think u are mixing up the fans, the fan inside the refrigerator would be the evaporator fan if that was broken then your compressor would be cold, the fan inside the compressor section would be the condenser fan, if that was defective then your compressor would be hot causing the compressor to short cycle. change the fan and clean your condenser coil and your problem should be gone,

Refrigerator running but not cooling

Is the fan running in the back compressor area?If not check voltage at the fan if there replace fan motor.[Condenser motor] Is the fan running in the frezer compartment if not check for voltage at that motor if voltage there replace motor[Evap motor]
Is their frost on the frezer back wall,in side the frezer compartment? if yes its a defrost problem.Use volt meter to check continuty on heater and term.thermostat [It must becold below 20 degrees to check term thermo.if those 2 ok its defrost timer

Refrigerator wont get cold

If compressor is running check and make sure your cond. fan and evap fan are running. Also check in freezer and make sure evap. coil is not covered in ice. Also clean your condenser coil. You could be low on refrigerant. There are quite a few things to check.

No cooling in fridge or freezer. Unit has power - light goes on.

Hi greenhouse76,

Please check if the compressor is running. If it is running and the machine is not blowing cold air inside the freezer. You may have either a restriction inside the sealed system or have a leak in the sealed system and all the Freon has escaped. No Freon, No Cool. Not a DIY job.

In order for the machine to get cold at all, the motor has to run. If the condenser fan (fan by the compressor) is running and the compressor is not running then you have one of a few problems. Either the motor is not getting power and that's why its not running, or its getting power and the windings inside are shot and that's why it's not coming on.

When the condenser fan is running you need to check to see if voltage is getting to the relays on the side of the Comp. More often then not, these are the parts that go bad. First Check for voltage to the relays and see it they have 120 Volts AC. If so, check the pins on the compressor that the relays connect to. From this point you are going to need to remove Compressor Relay Cover the clip that holds the relay to the side of the compressor, then unplug them from it and take them off.

Hope it helps.

Thank you for using FixYa.

Sounds like unit is getting power but fan doesnt come on

Confirm with a volt meter that you are getting the required voltage from the condenser fan motor contactor, load side of the contactor,which should be the same contactor as for the compressor. Is the comprssor coming on. If the compresor is coming on and the fan motor is'nt, than the fan motor or the run capcitor for the fan motor has failed.

Unit will not start up evaperator fan runs

Hi, if your indoor unit is running and you have high voltage to the outdoor unit as the compressor runs, I would check the control wires at the indoor unit, coming from the outdoor unit, and from the thermostat terminals to see if the condenser is wired correctly. I'm not sure what relay you are jumping out to get the compressor to run, and no fan, but if you look at the contactor where your high voltage leads connect, you can energize the contactor by pushing down on the plastic part of the contacts and the outdoor unit fan and all will start. Carefully, use a insulated screwdriver, or I have pushed them down with my finger to see, but be careful! You do have high voltage there or the compressor wouldn't have come on. If all runs when you do this, the thermostat control wires to the contactor have no 24 volt control voltage to it. Check your red and yellow wire connections. If you have a meter, check across the 2- for 24 volts. If you have no low voltage, this is your problem. Go to your indoor control section. If this unit has a circuit control board, look for a plug in type fuse like you would find in your car, a 3 to 5 amp fuse. Make sure its not blown. If the led light is on, it will be good. You have lost the low 24 volt power to run the outdoor unit. Check the wiring there, Red and Yellow. Make sure they are terminated. If none of this helps you or your not at ease doing these checks, call out the contractor and tell them that the outdoor unit will not run if it is new and just installed. They should have done a start up on it. Check the contactor first by pushing it down, it will spark but don't jump as it may scare you some. If all runs, check everything I have told you and you should find the problem. If you have any questions, contact me through this site by my user name, shastalaker7. Keep me posted.

Panel between doors is very hot-compressor is hot. With compressor running fan is not. There is 32V AC at the fan connection, but the fan says it is a 115VAC

Good day,
First step. Unplug the machine. Your ruining the compressor. If your model has a 115 volt ac condenser motor then that is the only voltage it will run on. If this has been going on for a while, good chance the condenser fan motor is terminal, if not near so.

The first thing is to find the complete model number, style and age of the machine. Could be the motor is controlled by a circuit board, but without that this is as far as we can go.
P.S. Check you meter in a wall socket, to verify it is reading properly.

My refrigertors stop working

First thing to do,is,see if the compressor is running,it should be humming,and warm to the touch.There should be a fan running under the unit,cooling the condenser.And the fan in the freezer unit should be running.If none of these are running,check to see if there is current in the wall plug,maybe plug it up to a known hot,receptacle.If the fan in the freezer is working,or the condenser fan,check the thermostat to see if it is working.If it is,take a 120 volt,volt meter,and check the voltage going in the compressor,if it is getting voltage,and is real hot to touch,then it is bad,the compressor,or if it s not running,then it is bad.If the compressor is running,and the large line off the compressor is cold,or near it,then it may be just low on freon.So many things to check here.
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