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Freezer burn to food is caused by air & moisture in contact with it. There should be a tight seal by the rubber gasket along all the inside edges of the freezer door. This gasket prevents unwanted hot moisture and hot air from entering the freezer compartment and causing ice build up. You can test the integrity of the rubber gasket seal by seeing how the freezer door will pinch a slip of paper in various spots around the freezer door. If the slip of paper pulls out easily, there is not a good seal at that spot. If that's the case (which I believe it is), the door gasket needs to be replaced. By the way, ice will build up over time because you need to access the food in the freezer, hence you will introduce moist air each time you open the freezer door.
If we have ice on the inside of the freezer it means air is being pulled into the box somewhere. The most likely place is the door seal, it sounds like you already checked it, but I would suggest that you look very close at the bottom and aides of the seal too, it could be leaking in air from there. Check the inside liner for cracks and seal them if you find any. Look at the corners of the cabinet to make sure there is not room for air to come in.
Air leaks will lead to frost, it is just hard sometimes to find where it is leaking in.
Without any additional info, there are a lot of possibilities:
1. Condenser coil (underneath unit) is dirty and clogged.
2. Compressor is failing. (need A/C tech)
3. Metering device is clogged. (need A/C tech)
4. Refrigerant charge is low. (need A/C tech)
5. Door seal is broken (frost will form around door).
6. Defrost heaters are stuck on (replace defrost timer located underneath unit at front).
7. Condenser fan has failed (underneath freezer on back).
8. Evaporator fan (inside fan) has failed (ice will form on cooling coil).
This should get you started...
If this helps you, please select YES to the first two ratings questions. Thank you, and Good Luck.
Frost free does not mean no frost ever anywhere. It just means that there is a mechanism to defrost the evaporator on a regular basis. If there is a spot where frost is forming in the box it may just mean that a little bit of moisture that is not collected on the coil may be finding another cold spot to stick. The area where the fan blows into the cabinet is bound to be the coldest spot in the freezer therefore an ideal place to collect frost. Check the level of the unit and your door gasket to be sure the door is closing tight and true.
If the door seals are still pliable and intact there are two possible causes.
1/ The upper door hinge on the top of freezer unit has two adjusting screws under a plastic cover/cap which allows the upper hinge to be set forward or back altering/adjusting the spacing of the door seal to the freezer body. Moving the hinge outward at the top will cause the door to seal tighter at the bottom and lessen escaping cold air and condensation to form (water droplets). Adjust carefully so as not to create a weak seal (air gap) along other sealing edges of the door frame.
2/ Many United Refrigeration Commercial Freezers are manual defrosting. Moisture from inside the freezer can condense between the inner molded door panel (door shelves) and the exterior metal door. Usually ice buildup will occur in this space, but when defrosting or during high ambient temps the ice will melt and drip out along the bottom door edge/seal. Screws alomg the door frame (hidden by the door seal) hold the seal in place and also the inner molded door panel. The inner panel can be removed to replace the seal or to remove the ice buildup.
yea def , not normal, nor an acceptable amount of ice forming there( good pic). heres what i have been told to try and with good results
first make sure the door gasket is sealing all the way,(small gaps in ht emagnets at extreme corners) is common but with a little amount of "mortite"or "permagum can sometimes be insterted behind the corner of gasket to assist filling the void.
second a small amound of a white/clear silicone be applied to the outer perimtere of gasket, to minmize air movemnt from between gasket and door panel.
lastley in oyour second pic i see "frost free" written on a plastic air deflector. you can remove that with 3-4 screws on backside of it, and then reinstall with a small spacer so as the baffle now with sit with a 3/8in. gap between it and the top of the freezer liner.( a brass ferrel from the compression fitting of a plumbing fitting is just the right size)..... the theory behind this is to prevent the air from gatting "trapped" in the void created when the door closes-- air can now pass back and forth freely.
I hope this gives you some satisfaction if not I would advise another tech be sent who is willing to call for factore tech support( ths is where i got my info from)