Manual for Nor-Lake FE26-928-DE - Nor-Lake Freezer Norlake Refrigeration 6' x 6' Kold Locker Walk-In Freezer - 6' 7'' High w/Floor

I searched using Google.com and could not locate a manual in the USA, UK, Australia, or South America on the Hisense web sites.

Apparently, there is a contact page in Spain (Espana) that might provide assistance. I used https://translate.google.com to read the Spanish data page. Email or telephone contact provided below.

https://www.hisense.es/congeladores/horizontal/ft124d4hw1-a/


https://www.hisense.es/contacto/

¿Tienes dudas sobre nuestros productos? ¿Alguna consulta sobre Hisense? Env?anos un email y ponte en contacto con nosotros. Para consultas de servicio tecnico, por favor, pongase en contacto con nuestro equipo en el numero de atencion al cliente +34 960 468 888 - De 9:00h a 20:00h de lunes a viernes.
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www.manualslib.com would be one place I just look it up and it is there you can download it for free.
ManualsLib Makes it easy to find manuals online

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.

look for the manual its usually underneath...remove the grille and look inside. sometimes its taped up

i can help you troubleshoot if you find!

The defrost system has failed and is not de-icing the coil or, the door is not sealing tight or too much time open allowing excess humidity to enter the chamber, thereby overcoming the capabilities of the defrost system. The system has a defrost timer someplace, check to see if it is running. If not, you can probably advance it into a defrost cycle with a screwdriver. (turn the shaft slowly until a click is heard and the system stops) Allow 20 or 30 minutes for the coils to defrost, and restart with the screwdriver if it has not took off on it's own. If the timer is found not running, replace it.

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.