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

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Turbo air frz goes into defrost compressor continous to run. Does not stop during defrot

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Hi, Please set your thermostat a bit warm and observe the compressor. Also check your freezer for leaking.

Posted on Dec 15, 2010

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Ive got an upright Whirlpool freezer that doesnt want to defrost. It takes about two weeks for the evaporater and defrost coils to totally ice up and then I have to take all the covers off and throw warm...


Fixing the defrost circuit is relatively simple. It made of three things, the defrost heater, the thermostat and the timer. The usual parts that fail are the heater and the timer. The first thing to check is the defrost timer. It looks like this:

slamfix_25.jpg It can found either near the compressor or in the little box inside that controls the temperature. What it does is that it powers the compressor for about 8 hours and then turns off the power for 45 minutes to allow the defrost heater to melt the frost buildup. The timer is run by a little motor. Often the motor stops working and the freezer is either stuck running the compressor continously or the defrost heater.

On the side of the timer is a little cam that you can turn with a straight blade screwdriver. Turn it until it clicks. When it does, the compressor should shut off and the heater should start to heat up. If you hear the crackling of ice melting, then the problem is with your timer not working. If the ice is not melting then the problem is either with the heater/thermostat. Check to see if the heater is burned out or use a meter to check continuity between the heater and the thermostat. If it is open then replace the heater and thermostat.

Any of the defrost parts should be available from an appliance supply house or online. Hope this helps you.

Jan 11, 2011 | Whirlpool 19.6 cu. ft. Commercial Freezer...

1 Answer

Frezzer is only 2 yrs old and already has defrosted on its own what seems to cause that?


This machine has an automatic defrost cycle that comes on automatically 4 times a day. During defrost the compressor goes off and the heaters inside come on and melt the frost from the coils. In about 20 minutes heat shuts off and compressor comes back on and freezes againl

Oct 18, 2010 | Continental Freezer Freezer display one...

1 Answer

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..

Sep 01, 2010 | Turbo Air 23 cu. ft. / 651 liter...

1 Answer

Freezer is warm, not freezing at all, fans run


If the fans your talking about are in the refrigeration section, then the unit is not in defrost. The interior fans shut off during the defrost cycle.
There is a condenser fan motor in the machine section by the compressor. If it fails, the problem you described can occur.
If that fan motor is still, and the compressor is cool to the touch, then no power is getting to the refrigeration section.
Could be a bad thermostat, or the unit has tripped off on the high pressure safety switch. The high pressure switch can be one of 2 styles. Auto reset, which means it will try to restart the compressor when the pressures become normal. The other has a lock out feature that requires it be reset manually. If it goes out on the high pressure switch, once reset, check the condenser fan motor to make sure it is running and/or excessive dirt in the condenser, which must be blown out.
Other causes can be a total loss of refrigerant, or a compressor that won't run.
Short of a broken wire all items listed except for a dirty condensor and reset of the high pressure switch, require a decent knowledge of electrical, Knowledge in the use of a VOM meter and amp-probe, as well as a set of refrigeration gauges.

Oct 30, 2009 | Turbo Air 49 cu. ft. / 1388 liter...

1 Answer

I wondered how long the defrost cycle was supposed to run on this Turbo Air TGF 49F freezer as I am not sure if a door was left ajar or if it is stuck on defrost if possible. I would like to manually over...


If it's frosted up, it's best to defrost manually with heat gun. Find the timer and advance until it goes back into defrost. The timer looks like a residential fridge. It cut the compressor off and the heaters on.
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Sep 06, 2009 | Turbo Air 49 cu. ft. / 1388 liter...

1 Answer

Turbo air freezer


Check the time setting on the defrost timer. It may not be set to the correct number of minutes for defrost. Compare it with the side that is working properly for the right time of the cycle.

Jul 25, 2008 | Freezers

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