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Thread: Compressor not starting

  1. #1
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    Fruitland, Idaho
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    Default Compressor not starting

    Model Number: ASD2624HEB
    Brand: Amana
    Age: 6-10 years

    I had noticed that the freezer was not keeping things cold over the last week or so. Finally, everything thawed. I also noticed that the compressor would try to turn on and would 'hum' or 'buzz' for about 15 seconds and then switch off. It would continue this buzzing every 5 min or so.

    I checked the start relay and it did not rattle. There was continuity from the white wire going into the back of the relay and the run and start terminal female connectors on the front of the relay. Also, there was continuity from the black wire in the back to the common terminal female connection on the front of the relay. There is also continuity from the run and start female terminals to the capacitor...I am not sure but I think that is normal.


    I also checked the resistance of the terminals of the compressor and got run to common 3.7 ohms, start to common 4.7 ohms, and run to start 8.1 ohms. I believe these are within spec for my compressor. I also checked for any shorts between each terminal and ground (both at the ground screw and a section of the case that I scratched the paint off of). All three terminals showed an open circuit to ground.

    I cleaned off the coils under the refrigerator as best I could and hoped that would help. Compressor still did not start.

    At this point I am stuck and don't know what else to troubleshoot. Any suggestions would be great. Thank you so much for this web site. I just fixed my microwave last week from this website and now (hopefully) the fridge. I don't know what 'Murphy' is going to throw at me next....

    Thanks in advance!!!!

  2. #2
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    Default

    It probably has a locked rotor. It's been a common issue on Amana refrigerators for the last 5-6 years. If it's not a locked rotor then it could be a high side restriction and has built up so much pressure the compressor can't start against the high head pressure. Either way it's a sealed system repair. Only a certified tech with a set of refrigeration gauges could tell you exactly what the problem is. Sealed system repair costs usually exceed the machines value.
    OWNER RICK'S APPLIANCE REPAIR
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  3. #3
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    Default

    Thanks for the reply. So that sounds like a hard start will not help if those are the issues. It was just my last hope of an easy fix...

    Thanks again.

  4. #4
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    Default

    Update...I cleaned off the very dirty coils last night and let the compressor sit all night to cool off. On a whim I decided to try it one last time before junking it. It started up and seems to be running fine. No buzzing or humming and it is cooling inside the freezer. Could it have been as simple as dirty coils?

    The other thing I noticed was that sometimes it was finicky to get a good connection on the start winding terminal of the compressor to check the resistance to common. Could it be that there is not a good connection from the relay to the compressor, and I just got lucky on his startup cycle?

    Thanks.

  5. #5
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    Heat will open the compressor overload same as amps will. So yes, if the coils were packed with lint and dust it would cause heat build up and trip the overload. Keep an eye on it, I think the internal bearings are worn out and the heat from the worn bearings causes the rotor to lock. It won't start again untill it cools all the way down again. You can't use a hard start on that machine because it will burn up the control board or adaptive defrost control.
    OWNER RICK'S APPLIANCE REPAIR
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  6. #6
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    Default

    Thanks Rick. So it did cool down the freezer for several hours, probably between 5 and 6 hours. Then it started doing the same thing. So basically I just got one cooling cycle out of it. Any possibility of a bad connection so it just doesn't want to restart after one cooling cycle?

    How warm do compressors usually run? If it is a heat build up during operation I should be able to notice that when it is running, right? How long would it take to build up the heat? Also, if the rotor locks due to high temp, would it then start cooling down naturally and eventually be able to start up again hours later?

    Sorry for all the questions...I really appreciate your answers.

  7. #7
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    Quote Originally Posted by nd_rawlins
    ....it did cool down .....started doing the same thing......doesn't want to restart after one cooling cycle...
    During the five to six hours it was cooling, the compressor probably cycled on and off about once or twice each hour. It doesn't sound like a bad connection. It sounds like from a cool or cold state the compressor runs for several hours until something causes the overload to open. When it's running check the amps and see if they increase the longer it runs.
    Click image for larger version. 

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    Quote Originally Posted by nd_rawlins
    How warm do compressors usually run?
    Compressors normally run warm to very warm. When the compressor starts running hot to extremely hot, it usually indicates a sealed system problem. Use these only as a guide:
    Click image for larger version. 

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    Quote Originally Posted by nd_rawlins
    .....if the rotor locks due to high temp, would it then start cooling down naturally and eventually be able to start up again hours later?
    Quote Originally Posted by rickgburton
    ...and the heat from the worn bearings causes the rotor to lock. It won't start again until it cools all the way down again......
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
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    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  8. #8
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    Thanks for the schematics and ideas. Unfortunately I do not have an ac ammeter. I only have an inexpensive little DMM with the ability to go up to 10 amp DC. I just saw on the specs that the compressor has a full load current of 1.26 amps and a current lock rotor of 19 amps. So is that when the current reaches 19 amps, the rotor locks?

  9. #9
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    No, more like, if the rotor locks up the overload will open at 19 amps
    OWNER RICK'S APPLIANCE REPAIR
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