Question about True 49 cu. ft. / 1388 liter Commercial Freezer GDIM-49NT

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True Freezer T49f Fans do not turn off when doors open, and compressor only stops running during defrost mode.

Just replaced the defrost timer on my True T49f Freezer. Now the fans continue to run when the doors are open. Also the compressor only shuts off when the freezer is in defrost mode. Never used to run this much before defrost timer replacement. HELP

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Posted on Feb 12, 2014

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Posted on Jan 02, 2017

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SOURCE: Freezer Not Fan not running!

Most all commercial freezers have some sort of fan delay/ defrost termination device. Commonly called a "Klixon" (pronounced clicks-on). It is a device that is attached to the evap. It's function is to terminate the defrost cycle when the evap reaches a certain temp, say about 50 degrees or so, to ensure there is no build up of frost/ ice on the evap. It then allows the compressor to run, and cool the evap down to a reasonable temp., say about 20 degrees, and then let the evap fan come on. It prevents overloading the compressor during a high temp condition, and it also prevents circulating warm air left from the defrost cycle. I believe this device is most likely your problem. With no air circulating, the box will no cool down.. I have seen them burn and/or slhort internally. They can come apart. too. I would look here for that problem. the True manufacturing website does not give alot of info on this piece of equipment, such as a wiring diagram but manuals are available.
Check this out and let me know how it comes out.

Posted on May 21, 2009

  • 1150 Answers

SOURCE: We have a true T49F freezer and the evaporator

Freezers have a sensor that is referred to as a "Fan Delay/Defrost Terminator". It senses the temp during the defrost cycle. Usually, when the evap temp reaches about 50 degrees, there should not be any frost or ice on it. This device terminates the defrost cycle. It also keeps the fans off so warm air is not circulated. When the evap gets to about 20 degress or so, the sensor switches on the evap fans. If the fans are not coming on, either the sensor is bad or the evap is not reaching the proper temp to cause the sensor to turn on the fans.

Hope is helps to clear up some things and point you in a direction as to what might be going on.

Posted on Jul 12, 2009

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Is my defrost timer broken or my thermostat? The freezer was holding -30 temp but now is at +30.


Is the compressor running? If not - the timer could be stuck in defrost mode. If it is ruinning, then the freezer coil should be cold. If it is choked with frost & ice - then the defrost heater isn't getting powered (bad timer or defrost terminator - or is getting powered but has burned out.

You should allow the ice and frost to melt completely before turning back on again. Typically ice and frost don't build up so bad in a few days time to cause the temperature rise you're describing If getting cold - the compressor and refrigerant is likely OK, if not the defrost circuit is suspect. If compressor running but not getting cold - a refrigerant leak / charge level may be causing the problem.

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2 and 4 are power for the timer 1 and 3 are load lines N is defrost termination.

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Fan does not come on nor does door light. Also will run to cold temp when it cycles off cabinet warms up very quickly


have you checked the door switch for each door? the lights should still work in defrost mode but not fans or compressor.

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True T72F defrost timer and lights not working?


You have done good work here young man. There is a relay or switch that is keeping the signal for being processed. I had the same similar problem with mine. At least your compressor is ok. Are you sure timer is wired back right.

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I have a Kenmore upright freezer model# 253.9260210. We noticed that our food was starting to thaw. I opened up the coil area and noticed a small piece of ice on the coils. I melted the ice and turned...


Feel top of the compressor and tell me how hot after it has been running awhile. I need also that you advance the defrost timer=>. 216517400 Defrost Timer
12_9_2012_4_41_32_pm.jpg

clockwise slowly untill the compressor stops or starts. I need to make sure the timer is not stuck into defrost. I want you to leave the compressor off for up to 35 minutes. If the freezer compressor doesn't restart bt then simply again turn the timer clockwise slowly until it does and then stop turning. The defrost timer is location 23 in this photo HERE If you need to turn the defrost timer like this to restart the compressor then replace the defrost timer and this will resolve the freezing problem. If not we move to the defrost heater location 14 in the sme photo=> 216254600 Defrost Heater
12_9_2012_4_51_55_pm.jpg

I am going to stop here until I hear from you, Thanks Sea Breeze

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We have a true single door freezer, it is iced up inside . what should the dial inside the unit be set on.


On the freezers a setting of 7 or 8 should do fine. I would be more concerned with the defrost timer, defrost heater, and settings. Also a HUGE problem is that the door switch on the top center of the door can sometimes barely contact the door (this happens when a unit is slightly warped or out of level) or the spring loaded hinge on the door can break causing the door to stay propped open at times. When the door doesn't close the evaporator fan stops but the compressor will continue to run. I have had to tape a nickel on top of the door to make better contact with the switch. Make sure the switch isn't the problem before going any further.

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I have a T-49 freezer with compressor running defrost timer board is showing in refrigeration mode. I have power on the #4 terminal going to the evaporator fans. Both door switches are closed. I am not...


most freezers have 2 controls. 1 is a defrost terminator and the other is a fan delay. the delay and the defrost terminator can sometimes be a "2 in 1" type switch. you would have to study the wiring diagram. The delay will not let the fans come on untill the evap reaches a preset temperature. take another look at the diagram. It may be that the evap is not getting cold enough. you may have a refrigeration issue.

May 15, 2017 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

We have a true T49F freezer and the evaporator fans are not running. The compressor is running on startup. The coils are cold. But are freezing up. Shouldn't the fan be on, or does the cabinet have to...


Freezers have a sensor that is referred to as a "Fan Delay/Defrost Terminator". It senses the temp during the defrost cycle. Usually, when the evap temp reaches about 50 degrees, there should not be any frost or ice on it. This device terminates the defrost cycle. It also keeps the fans off so warm air is not circulated. When the evap gets to about 20 degress or so, the sensor switches on the evap fans. If the fans are not coming on, either the sensor is bad or the evap is not reaching the proper temp to cause the sensor to turn on the fans.

Hope is helps to clear up some things and point you in a direction as to what might be going on.

Jul 12, 2009 | True 49 cu. ft. / 1388 liter Commercial...

1 Answer

TRUE freezer model number GDM-49F.


Your unit should have a defrost timer.The timer may be stuck in a defrost.It should be located at the bottom of the unit next to the compressor.Open the door to the timer and observe the position of the timer.If you turn the knob and the unit starts up,it's the timer. If this is the case, you can purchase a new one at any local a/c supply.Let me know,Mike

Dec 13, 2007 | True 49 cu. ft. / 1388 liter Commercial...

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