I have this freezer and it is forming ice on and around the door and won't stop running. I've checked to make sure the door is closed and sealed and it is. What can be the problem?

Unplug the drain tube by shooting hot water down it with a turkey baster. It is located underneath the evaporator.

You have bad door seals. Try hitting with a heat gun type, dryer just a little heat.. Then close door for 24 hours

Check the rubber seal inside/around the door. I bet you have a tear or piece of seal that isn't making a solid fit and it's allowing (warm) room air into you freezer. This moist room air will either turn to water droplets and builds up to enough droplets to form puddles in the bottom of the freezer, or it freezes into a blob of ice around the door seal and this allows warm room air into the freezer. Otherwise you need an Appliance Tech to check the Freon refrigerant level. Most times its the door seal causing this problem.

how old is your model you have. a weak pump will make the system slower to get to temp even a broken seal can do this. even just a few mil gap can make it do this. if you close the door then re-open it it should be harder to open the door. this is the seal being nice and tight to its fittings.

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.

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.

The door seal is at fault. Regardless of the small tear it is not sealing well.
Take a dollar bill and close it in the door. Then pull on the bill to feel resistance.
You will find it pulls easily in some place. That is where your air leak is that is causing the condensation.
Do this about every 6 inches all the way around the seal.

You should check for air leaks around the door gasket or any other openings in the compartment such as where pipes or wiring is going through the wall. It sounds like a moisture problem from moisture being drawn into the compartment pass door gaskets or access holes.

You said you checked the seal but one thing you can try to be double sure the seal is tight put a thin layer of vaseline along the entire seal it will fill in any gaps and you can be sure it is sealing completely.

i wouldn't worry about vacuum seal. door gaskets contain a low powered magnet around the entire face for "contact" seal, id look into perhaps something placed on one of the shelves or door blocking the door from closing as tightly as you remembered. if you have a problem with that gasket. it would have to be physically ripped and where it didn't make contact you would have an influx of warm air resulting in ice balls forming inside door liner adjacent to seal