Question about Maytag SkyBox MBV1976A Beverage Dispenser

4 Answers

I have a Skybox (MBV 1976AAB) I am trying to restore it, so I replaced PC connector board, where the circulating fan plugs into (the fan socket was corroded on the board). Replaced temp control (it didn't seem to keep the proper temp). I read a suggetion, where a commercial repairman added a second circulating fan to help with the cooling. I did the same, by splicing a second, equal fan in with the primary circulating fan. They both ran fine, and the sides of the box didn't heat up as was the case before. But now, it seems that the circulating fans are conatantly running, where the compressor will switch on/off as is needed. Is this normal? Does the circulating fan have it's own temperature switch? Did I screw something up by adding the second fan? BTW, the second fas has been removed, but it still seems that the primary fan is still constantly running. Please help.

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  • 2 more comments 
  • Monsterzero May 27, 2010

    Unfortunately, the service manual does not address the issue of the circulating fan, and how to test it.
    Does anyone know for certain if the circulating fan on the
    Maytag Skybox is supposed to run continuously or intermittently?
    Can any Skybox owners confirm how their circulating fan runs, please?
    Finally, if my unit's fan is not supposed to run continuously, what needs to be fixed/replaced? Thanks in advance.

  • Monsterzero May 27, 2010

    I've already reverted the fan back to the original layout, which is just one circulating fan. What I need to confirm is whether or not the fan is supposed to run continuosly or not. If it's notsupposed to run continually, then what needs to be addressed?
    maybe some owners of the Skybox out there could confirm if their Skybox circulating fan runs continually or not?

  • Monsterzero May 27, 2010

    Is the circulating fan in the Maytag Skybox (Model # MBV1976AAB) supposed to stay on constantly, or is it supposed to switch on/off as needed, like the compressor?

  • Monsterzero May 29, 2010

    Finally, a direct answer to a simple question! Thank you very much kel1guy2002. I appreciate your help.

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4 Answers

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  • Maytag Master
  • 3,740 Answers

Hi and welcome to FixYa I am Kelly.

On these units the compressor switches on and off. The fan runs constantly to maintain and even temperature for the contents. It is always powered by the main board from connector J2 with 12VDC.

You did nothing wrong the unit is operating normally. I would be a bit weary about using 2 fans as the Main board PCB transformer may overheat and burn out trying to produce enough power to run 2 fans over an extended time. Most PCBs are capable of providing the needed power for all circuitry but no extras...

The air flow from the fan should be blowing toward the evaporator coils and not away from them. Seems in 2004 they figured out some of these were assembled incorrectly. See this bulletin: http://www.servicematters.com/maytag_library/docs/TDR-0041-S.pdf

This is the service and installation manual:
http://www.servicematters.com/maytag_library/docs/16022983.pdf

Thanks for using FixYa.

Kelly

Posted on May 27, 2010

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  • Master
  • 4,924 Answers

If you aded the second fan in parallel that could not harm anything and if they supposed to cool the device the only way that could affect it is to short the time they work ..cause all thermostat guided fan are programmable ..(so you should have a min temp switch off point in the settings ..and you should been able to be set to a certain temperature to go on and off ...practically to have a max point to go on ..and a lower one to go off) So if you do not have such a thing in the setting menu ..you do not have a thermostat switch for the fans...inside..Like you already said the sides of the case already have a lower temperature ..so this is a good thing for the system to work ..The only thing you should be worried is if they do not run on when they should ...cause in this case you will have a bigger task on the other cooling devices..
The fans themselves are not big consumers of power ..so if the will run all the time this should not be a issue ..
Anyway ..if the compressor run first ..and the system is cool inside...than its all ok ..when the fans run all the time and the compressor too and the unit is not cooling well than it is a leak on the system ...
anyway those fans are just circulating the air to level the temperature and they are just to make the system job easier...and not to cool something that is heating ...I think ..and in this case they should run all the time ..or you can make them a manual switch for use in special cases when you do not see the point in keeping them in use..

Posted on May 27, 2010

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  • Catalin Turcu
    Catalin Turcu May 27, 2010

    I already said that ..if it do not have a setting for it ..or any other reference on the controls ..it is supposed to stay on ....and ventilate the air for even dispose of the cold ...this way the temperature is even in all the container..and its easier for the compressor..which do not have to switch on if in the front the air is detected warmer.....so if it do not have a setting device to input a interval of temperatures in what it stays out ...it means that is like all old ones and it runs all the time ..

  • Monsterzero May 27, 2010

    Well, not being a Fridge expert, I don't know if the temperature control, which I replaced, is supposed to control the circulating fan & the compressor? I know that when I set the temp control to a certain level, the compressor turns on/off accordingly to maintain the temp setting. But, even if I turn the control to its lowest setting, the compressor will turn off, but the fan keeps going.

    Would the temp control be considered a "switch" for the fan and compressor?

  • Catalin Turcu
    Catalin Turcu May 27, 2010

    that's what I tried to explain that the function of the fans do not requires turning them off..cause they are for making the air circulate and so this way keep and even temperature ..so in my opinion they suppose to go all the time ..but I know that for the newest models all this functions are controllable and changeable according with the needs..what I'm telling is that the compressor is the one that is important the fans are not big consumers and of they work all the time makes no difference ..the difference would be if they would not work when they supposed to ...cause it that case you will have difference in the temperature inside from one end to another ..and cause condense and ice ...so if they run all the time its just fine ..

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  • Maytag Master
  • 12,061 Answers

Http://appliancejunk.com/forums/index.php?topic=3893.msg15467#msg15467

Your manual above. Hi. if you go to this website above you will find your service and troubleshooting manual as well as other very helpful resources, please use these resources to troubleshoot and hopefully isolate and repair, your unit.
You shouldn't just, "Splice in" a Fan as you see, the temperature controller, uses the resistance of the fan, to calculate the speed and set it correctly. To control the temperature, it is a finely balanced system. What you really need to do, is ADD another FAN in parallel, across the Positive and Negative, connections. Or better still, install a better SINGLE fan, that moves more CFM, than the existing one. This will then allow the system, to operate as it was designed to do. Of course, you could always just use any other 12V DC, supply, and hook that up to a Fan, and let it run "Blind" as we say when it has no Temperature Control. In fact there is NO reason why you couldn't retro-fit a temperature controlled separate Fan, quite apart from the existing one. Use this in conjunction with the existing one, which really should be returned to the way it was.

Posted on May 27, 2010

  • rmcamp540 Jan 01, 2011

    I have a skybox and the fan does not work. I checked the fan by another source and it works, so I think it may be the circuit board. Everthing else works, except the fan. How could I hook up the fan by not using the circuit board. Is there away to extend the wires on the fan and run it from the circuit board that is located near the compressor? If not, how could I hook up another 12v dc source?

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  • Master
  • 1,554 Answers

It is normal that the circulating fan runs continuously to maintain the temperature of the refrigeration chamber.

Posted on May 27, 2010

  • 1 more comment 
  • Monsterzero May 27, 2010

    OK, but when I called Maytag's customer service dept. today I was told that the circulating fan should switch on and off. Supposedly the service rep put me on hold and asked a "technician" specifically about my model Skybox. Was I misinformed?

  • Jahn27
    Jahn27 May 27, 2010

    The electronic control must be faulty if that is the case because the circulating fan is directly connected to it. The circulating fan just a simple fan without temperature switch to turn it on and off. Here's the service manual for your reference.

  • Jahn27
    Jahn27 May 29, 2010

    As what I have pointed out, it is normal that the circulating fan runs continuously to
    maintain the temperature of the refrigeration chamber.

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The circulation fan is supposed to run all of the time to keep the contents at an even temp. Also check the compartment door seals for damage. If the seal is damaged ambient air will cause the top of the compartment to warm up.

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