SOURCE: Replacing a temp control valve on a true GDM 26 commercial refridgerator
Unplug the unit & remove the plate holding the thermostat. The capillary for the thermostat will go into a very small tube that runs into the evaporator coil. You will probably not be able to see the tube but will have to feel for it and get a good orientation for where it is located before you pull the capillary out. Try to measure the amount of capillary in the tube as you pull it out so you know how far you have to push the new one in and put some kind of tape or mark on the new capillary before you try to push it in. you might have to soap up the capillary to get it to slide easier.
SOURCE: We have a GDM-26 commerical coke machine. Only
If any of your drinks are freezing you need to adjust your temp setting. The suggested setting is 5. changing the temp setting basically tells the refrigerator to stop cooling when the temp hits a low degree, and to start cooling when it hits a high degree. This keeps your drinks not to hot, not too cold, but just right. If this doesn't work I would change the cold control altogether, it might've went bad. If you have a few minutes, locate the condensor fan (bottom) and make sure it is periodically turning on and off like it should.
SOURCE: Fan works, just stopped cooling TRUE GDM 26
there is a leak of gas in the system,must see where the leak is, repair it then fill the gas,
SOURCE: My true Model: GDM-12 temperature fluctuates too
Install a constant cut-in thermostat. Constant cut-in temp of 37 degrees coil temp.
SOURCE: Tru GDM-47 cooler evaporator icing up.
possible bad defrost timer,or control on an off is bad,were you adjust temperature...thermostat from 30 to 65.00 dollars....possible there is leak or unit is under or overcharged..more than likely under charged...possible defrost heater is not working...good luck..michael doctor airr appl.repair..service tech..843-384-8474...call if need additional help ..its free..
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