Https://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/TRUE-GDM_iom.pdf
Here is the site for the ops manual. should walk you thru how to do temp adjustments.
SOURCE: 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
SOURCE: I have a true freezer
well most t stats have a differential of 5 to 7 but almost never more than ten deg so that the compressor wont short cycle .something you can check .some t stats you can adjust the differential on check if yours has that adjustment screw on the side or back of T stat if you need more help or parts e mail me at [email protected]
SOURCE: Do you have a wire
You have to contact True and they will send it. They do not have this on their web site. Just user manuals. 1-636-240-2400
SOURCE: product in my true gdm-49f
Try defrosting the unit by shutting it down until all ice is gone. If this corrects the problem and the ice returns you may either have a defrosting problem or a low freon charge.
Could be a number of things. It has a thermistor that sits on the evaporator to keep the fan off until it gets cold. It also has a switch above the door that switches the fan on when the door's closed. It could be a loose connection in the wiring, or, lastly, it could be a seized fan
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