Turboair freezer temperture problems - Turbo Air 49 cu. ft. / 1388 liter Commercial Freezer MSF-49NM

You need a new regulator. get the manufacturer and make and numumbers and look it up and save hundreds putting it in yourself.

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Difficult for you to check this I'm afraid, if the fan on the cooling unit is working unless you have an experienced 'ear' you will not hear the compressor running or worse still occasionally clicking.
Possible faults are
1. Compressor not running (the fan will run even if the compressor does not) electrical fault
2. Compressor seized (consult your service guy) also true for the rest of these
3. Compressor not pumping
4. Refrigerant leak

Not much hope for a cheap repair

find the adjustment knob, set it to a desired tempreture and allow 24 hours for adjustments

Tried to find the code "CO" in service manual but to no avail and please furnish the proper model number as none you list appeal. You stated that the unit sat for 5 months so I am wondering if your unit has developed a restriction in the capillary tube as this unit uses R 134A which has this problem.

look in the refrigerator section by the light you may need to take off the light cover ... or it may be down on the bottom behind the air grille

the problem is your tempertur sensors or your temp' control unit.

http://www.turboairinc.com/TB-Service/Service.html#SANDWICH
Try this web site. It has you M3 listed with manual but needs exacting model number to get right one.

good Luck - Hope this works for you. If not, let me know.

From 0 to 10 degrees. Ice cream should stay very solidly frozen.

Behind the grille on the bottom is a drain pan. May have a crack in it.

Our manual says it can take our freezer up to 48 hours to get back to the correct temperature. I found that to be the case when we loaded it fully for the first time.