Question about Turbo Air 49 cu. ft. / 1388 liter Commercial Freezer MSF-49NM

1 Answer

Msf-49nm will not stay below freezing!!

Every now and then the freezer temp. starts to rise and holds around 20 degrees Faren. It will not go down even though we cleaned the condenser. The darn thing still tries to defrost even though the food inside is not frozen. We are out of warranty and have to call a tech every time. Is this a common problem and how can we get it back to the negative tempuratures? Thank you for any advise or help.

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  • nemo_tone Jun 03, 2009

    First, thank you for your brilliant response time. Same day! Much appreciated. When I say once in a while, I would have to say about every 3 weeks to one month.

  • Dennis Boxerman May 11, 2010

    http://www.turboairinc.com/TB-Service/Om...



    Try this web site. It is a manual on your unit.



    When you say the temp goes up every once in awhile, do you mean once a week, once a day, or more frequent. Let me know as this does tell me some thing.

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  • Turbo Air Master
  • 1,035 Answers

My next question is, you say you have to call a tech to come out. Is he doing something? And if so, what? With the limited info I have at this time, it sounds like there may be a refrigerant problem. Let me know so we can continue. Am looking forward to resolving this.

Posted on Jun 05, 2009

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How lpw of a temp. Can this freezer reach..and and if only 0 degree could the thermostat temp control be changed out so it could reach les than 0 temperatures like negative 20 or so?


There are different models made for holding different products. Yours has a 1/3 hp compressor for above 20 degs. It may have 0 on the thermostat and may well pull down that far, but -20 would be out of it's reach. Where as it's sister model is made to freeze to below zero has a 3/4 hp compressor. Larger compressor for the lower temps.

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It seems that the temp more often goes up to 20-30's and that food is not as frozen when I check it. When temp goes up I check it for next couple of minutes and usually within 10 min the temp is back down...


This is normal. All commercfial freezers must defrost 3 to 5 times a day, or they will freeze over at the coil and then stop freezing. A timer in your freezer turns off the compressor and turns a heating element on for 10 to 15 minutes. During that time the coil heats and melts frost from the coil. Usually within 30 minutes the temperature will briefly rise to 20 t0 25 degrees F and then quickly drop down to 0 degrees F. The food rarely defrosts in this short period of time..

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Msf-49nm evaportor pan and drain iced up


I deal with MasterBilt which is a private lable made by TurboAir.
I have several units but only one does this icing up thing. Look for a bad seal on the door gasket. These really ice up if that does not seal almost perfectly. Look for premature termination of the defrost cycle. Check that the heater is pulling amps. The wiring diagram at "turboairinc.com" is very poor but it shows 2 heaters for the refrigerator. They list a diagram for the freezer but it's not there. I know for sure that there is a heater for the evap but don't know about the drain. I've seen some have it and some don't. there tech support line has much to be desired but it's worth a shot. Also, the bottom hinge on the door fails fairly regularly. This allows the door to drop just enought to disengage the switch at the top of the door and stop the evap fan from running, thus causing a freeze up.
Good Luck . You got your hands full with this one.

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It sounds to me very likely that your thermostat isn't functioning properly. change the settings and wait to see if it responds. If the thermostat is working it should shut down the compressor when you increase (rise) the temperature and aversly start it when you drop the temperature. Always let the unit sit for 3 minutes for the pressure inside to equalize before restarting. Good Luck

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