I need a wiring diagram for a Nor Lake walk in freezer

The pressure control will be fed a live from the thermostat and feed a live to the compressor relay

if the temp is 10f compressor is fine, just need a tune up, call a specialist.

L1 goes to 1-2 on Clock, L2 or Neutral to N on Clock, Defrost heater to 3 on Clock, Defrost Limit/Fan Delay to X on clock

I have a generic wiring diagram that I use on all my installs that works very well. It is basically the same for most all commercial walk in freezers. Send me a email address and I'll scan and forward what I have.

Normally, freezers are at 0 degrees. If you have ice cream, shoot for -10 degrees.

hope this is what you are looking for.

Compressor 12/3 with 20 amp dual pole breaker. 220 VAC

Freezer 12/3 with 20 amp single pole breaker 120 VAC

The factory presets your temperatures to the MID / MID setting of 0ºF for the freezer.

I assume there is no manual control for setting temp. so the thermal sensor or control circuit has failed and it is just staying at its maximum.  You will probably get more help from the manufacturer but their website is somewhat disjointed; looking for contact info for your product ends at one point and then shifts to their scientific product line.
The only general contact info I found is here:
Nor-Lake 
You will in any case need to have the correct model number at hand since the subject line doesn't sound like your freezer. 

The door frame heater is probably damaged and grounded. Unfortunately, it is still energized causing less than the entire heater being utilized which will cause an extremely hot condition. I would look at replacing it. It is a pain to do but with some patience, it can be done.

Good luck and hope this helps.

yes. it will just take more time to cool to room temperature.