The inside of unit is only reading 20 degrees. Door seal is okay.

The light may be staying on and creating heat, or the unit thinks the door is still open.

Or the door seal is worn and is letting cold out.

Or

It needs gas.

Have you put a thermometer inside to check the temperature? It should be 0'F +/- 2'.

https://www.google.com/search?q=Kenmore+upright+freezer.+The+alarm+keeps+going+off

..

Running all the time means you either have to clear/clean your condenser... Check for good tight door seals... and make sure the doors/vents are not blocked by any contents...

Free flowing cold dry air inside... sealed compartments is ideal.

Dollar Pull test:
Use the dollar bill pull test all round your doors...
(brown paper sack is cleaner & nicer):

You can take the paper...
close the door on it..
Pulling it out you should feel mild but constant pressure around the full perimeter of each door (or drawer).

If you do NOT feel it the door/drawer needs to be checked for gasket integrity... and the door may need to be adjusted.

New door gaskets are not terribly expensive
(but most issues are caused by spilled food, cleaning
or door adjustments = easy).

(FULLY covered in every owners manual I've read).

Consider purchasing 2 TAYLOR BRAND refrigerator
thermometer & turning the freezer to the ZERO Fahrenheit
area and the refrigerator to 33 or 34 degrees above zero
(32 degrees Fahrenheit... being frozen eggs & milk (too cold)).

Else... comment me back...

We can take this all the way into refrigerant level check if you find NOTHING ELSE WRONG

((HIGHLY IMPROBABLE... but do-able)).

You gasket is showing as no longer
available... at appliancepartspros.com...

So be gentle!!!

http://www.appliancepartspros.com/frigidaire-gasket-door-white-216522312-ap2113453.html (Frigidaire 216522312)

You say refrigerator SIDE not cold? You would expect the outside panels of a refrigerator to be around room temperature or warmer as the fridge removes heat from inside the cabinet and expels it outside. If you mean the inside of the fridge is not cold then check the door seals are sealing correctly around the door frame. You could also check that there is nothing inside the fridge protruding and therefore inhibiting the closure of the door correctly.

The door seal has a magnetic property to it. Until the freezer gets to a certain degree the magnetic porperties of the door seal dont react properly. Make sure the door seal is properly adjusted. If the door was left open it could have semi warped the door. This gets corrected when temp drops to correct temp. Reset freezer by unplugging and waiting for a few minutes. If problem persist contact appliance technician.

If you have any more questions you can comment me back.

http://www.searspartsdirect.com/partsdirect/part-number/Frigidaire-Parts/Freezer-Parts/297216600/0046/253/Model-LFFH2067DW7/1428/0142000?keySuffixId=NA&productTypeId=0142000&searchModelNumber=LFFH2067DW7&subCompDesc=System&brandDesc=FRIGIDAIRE&modelDesc=FREEZER&blt=11
Thermostat is what I would suspect first.

The defrost timer is the next suspect : http://www.searspartsdirect.com/partsdirect/part-number/Frigidaire-Parts/Freezer-Parts/297216600/0046/253/Model-LFFH2067DW7/1428/0142000?keySuffixId=NA&productTypeId=0142000&searchModelNumber=LFFH2067DW7&subCompDesc=System&brandDesc=FRIGIDAIRE&modelDesc=FREEZER&blt=11

I think the defrost heater is probably okay and it is just getting the wrong signals from the above components. But it is item 14 on this diagram: http://www.searspartsdirect.com/partsdirect/part-model/Frigidaire-Parts/Freezer-Parts/Model-LFFH2067DW7/1428/0142000/R0805140/00003

Hi,
Please check : - Your door ( gasket /seals, small air leaks) - Refrigerant level - Temperature sensor for failed
Regards,

This means the temperature is rising and alerting you to have it repaired. Make sure no one left the door open and that nothing is keeping the door from closing and sealing all around. If these are okay I would need a little more information like the model number from the tag inside the unit to help figure out what might be wrong.

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.

1. Make sure the sealing gasket is making good contact all the way around. It's pretty easy to lose 10 degrees. If it is a magnetic seal on the door gasket, it may not be sealing all the way around.

2. If it is staying that cold, everything is working well enough. Maybe you need a little gas in the compressor. Time for the service guy.

By the way, is your unit speced to be that cold full of supplies? Is the door opened frequently? minus 35 is pretty cold.

where can I find shelves, etc. for my Subzero 211RFD refrigerator