Turbo air model: msf-23nm, drain pan and drain tube frozen. Is there a drain pan heater and a drain tube heater. I called turbo air and told them specifically what i needed. they sent drain pan with heater taped across bottom, but no drain tube heater

Do you mean the MSF-23NM and the TSF-23SD? If so, you can find the information for them here:

http://www.turboairinc.com/TB-Products/Soliddoor.html

Basically, the difference between the two is that the MSF-23NM runs on more amps and is a new "maximum" series that Turbo Air came out with.

http://www.missionrs.com/MSF-23NM.html
http://www.missionrs.com/TSF-23SD.html

The product spec sheets at the two links above should be easy to download from our site. If you have any trouble, you can call us at 1(800)319-0690.

It sounds like you may be low on refrigerant (freon). One way for a novice to check this is to look at your compressor. There are two line coming out of the compressor. The comressor is the black thing about the size of a bowling ball under your freezer behind the grill. The small line coming from the compressor to the "radiator" behind that lower grill should be very hot coming from the compressor. The big line going into the compressor should be very cold to the touch. If that is not the case you are low on refrigerant. Without gauges and a supply of refrigerant you can't fix it yourself. Second thing to check is the thermostat is it set all the way to cold? If not turn it clock wise 1/5 turn and watch to see if the temperature goes down.

This is normal. All commercfial freezers must defrost 3 to 5 times a day, or they will freeze over at the coil and then stop freezing. A timer in your freezer turns off the compressor and turns a heating element on for 10 to 15 minutes. During that time the coil heats and melts frost from the coil. Usually within 30 minutes the temperature will briefly rise to 20 t0 25 degrees F and then quickly drop down to 0 degrees F. The food rarely defrosts in this short period of time..

The thermostat is faulty.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

http://www.turboairinc.com/TB-Service/Service%20Manual%20%20-%20April%202008/MSF-23NM.MSF-49NM.MSR-23NM.MSR-49NM.MSR-23G-1.MSR-49G-2.pdf
this web address should take you to the manual for your unit. check the settings on the controller first. If that does not resolve, let me know.

get a sheppards hook a parts store can help you tell them your prob

here you go: http://www.turboairinc.com/TB-Service/Service%20Manual%20%20-%20April%202008/MSF-23NM.MSF-49NM.MSR-23NM.MSR-49NM.MSR-23G-1.MSR-49G-2.pdf
takes alillte to load so be patient
hope this was helpful

My next question is, you say you have to call a tech to come out. Is he doing something? And if so, what? With the limited info I have at this time, it sounds like there may be a refrigerant problem. Let me know so we can continue. Am looking forward to resolving this.

I deal with MasterBilt which is a private lable made by TurboAir.
I have several units but only one does this icing up thing. Look for a bad seal on the door gasket. These really ice up if that does not seal almost perfectly. Look for premature termination of the defrost cycle. Check that the heater is pulling amps. The wiring diagram at "turboairinc.com" is very poor but it shows 2 heaters for the refrigerator. They list a diagram for the freezer but it's not there. I know for sure that there is a heater for the evap but don't know about the drain. I've seen some have it and some don't. there tech support line has much to be desired but it's worth a shot. Also, the bottom hinge on the door fails fairly regularly. This allows the door to drop just enought to disengage the switch at the top of the door and stop the evap fan from running, thus causing a freeze up.
Good Luck . You got your hands full with this one.

most commercial freezers have a drain to the back of the compressor area where the condensate goes into a pan and is boiled off into the air by a loop of hot gas tubing in the pan or an electric heater in the pan. when it defrosts the ice on the coil melts and the water flows out . if the tubing gets plugged the water flows out of the pan and down into the bottom of the box where it refreezes on start of the next refrigeration cycle. clean and clear drain with a shop vac or air hose where water can flow out of pan under the evaporator coil when it defrosts. if you have a domestic residential freezer , most of these have no defrost and neeed to be shut down and manually defrosted every few years. if you leave the door ajar or it doesn't seal well ice builds up and can accumulate in the bottom as frost etc. it would be mosyt unusual for a residential box to have a defrost clock, drain and all, but possible and same rules apply. find the drain and clear with shop vac .