My upright freezer is freezing everything but ice cream. Control panel says high temp. Setting at coldest temp. Checked defrost and fan all working fine

Check to see if the fan in freezer is running if it's not it probably the cause all also possible the coils are frozen in freezer this would happen if the defrost system failed

NOTE: This
is a multi-solution answer since I don't have all the tech from your question to pinpoint your problem
But the solution is in here generically, if you read and study the solutions very,very carefully.
First I would check cold control. Thats where you turn it off, if your temp is not warm. it can
be defective and not shutting off. If your temp is warm proceed with the following.
I would check the fan in the freezer. Listen to see if it is running
It moves air to the ref from the freezer
Then check to see if FREEZER CONTROL is turned WARMER WHICH MAKES THE REF COLDER AND VICE-VERSA. SEE?
The ref. temp should be about 33-35
The Freezer temp should be 0 to 10 Any thing below these temps is overkill and a waste of elect
The higher the number you turn it up to is the coldest
But is probably a common defrost problem The ice build up
is not being melted by the defrost system.The fan can't blow through the coils into the fridge.
Take out back panel of freezer to check for ice buildup. The coils should be clean.
There are three components to a defrost system- a heater,heater thermostat, and a timer unless you have a defrost electronic card.
Its best handled by a Technician but you could possibly do it by taking your model number to the nearest appliance parts store and asking for the parts. They are mostly located in freezer ,behind back panel on freezer coils.except the card which is usually located in ref The parts store will have info
Also check fan undernearh Ref in the rear
Clean condenser coils underneath
Make sure back cover is on the fridge. Some take them off and throw them away.
make one out of cardboard if its gone, using the holes of the old one.
.I'm including my article on Refrigerator Repair for your help and convenience.;
Please click or copy and paste into browser for Article

http://www.fixya.com/support/r5816737-fix_refrigerator_psychologically

If you need more help go here:

http://www.applianceaid.com/procedures.html

MORE TIPS AND TRICKS:
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STOP PAYING FOR EXPENSIVE WATER FILTERS FOR YOUR REF. DO THIS====
http://www.fixya.com/support/r9962087-stop_paying_high_price_refrigerator
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WATER SPLASHING IN FREEZER AT ICEMAKER
THE FILL TUBE IN BACK OF REFRIGERATOR CAN SLIP
AGAINST THE FILL RESERVOIR CAUSING A PARTIAL BLOCKAGE
OR BECOME CLOGGED WITH ICE.
REMOVE THE ICEMAKER AND INSPECT THE FILL TUBE.
RUN WATER IN TUBE TO ELININATE BLOCKAGE AND CHECK
TEMP IN FREEZER. IF TEMP IS BELOW 0 DEGREES, THATS
OVERKILL AND USUALLY A WASTE OF ELECTRICITY TO KEEP IT THAT COLD, NOT TO MENTION THE FILL TUBE FREEZING UP
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Leo Ponder
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I keep min two notches from the coldest setting.A great way to check where you should set yous,is ice cream.Put an open container of ice cream in the freezer,and turn the freezer to coldest.The next day try to scoop the ice cream.If the ice cream is hard the freezer is too cold.Adjust the freezer two notches ,and try the ice cream the next day.Repeat till you are happy with the hardness of the ice cream.It should be easy to scoop but not too soft.

i had the same problem and it turned out to be the sensor, a $15 part. it pretty much controls everything related to defrosting.

If this is a self defrosting model make sure that you don't have frost build up on the back wall of the freezer causing the air not to circulate like it should. If you do have frost build up other items will eventually start thawing as well. If this is the case you have a defrost problem.

If this is not a self defrosting model then make sure it does not need defrosting.

You normally will notice ice cream being soft before you notice other things thawing.

Also make sure the door is shutting good and you may try putting the ice cream in a different location.

If the fans not working, replace the fan. You could have a defrost problem that causes evaporator boils to freeze over and may be obstructing fan blades. Check door seals also that they are sealing properly.

Is there frost on the freezer panel? are the two motor and compressor running (freezer motor and condenser motor)? find this out 1st. this is nothing you did but if you are not mechanically incline at this point only a frig tech can properly check and tell you exactly what is it. theres are the things it might be...
compressor not working
condenser not running
freezer fan not running
thermostat not sensing temp.
stuck in defrost
heaters on too long
bi-metal shorted
timer not working
now if you paid alot for this frig at least get someone to look at it for a service call ($40-60) if it too high to repair then its time to get a new one

Hello there:
first make sure that the back of the unit is clear of any dirt or obstructions
also make sure that the food is not stacked up so high that the air cannot circulate also you may want to check the temperature setting if the unit does not respond to a lower setting your refrigerant level may be low or than you will have to have the temperature controle thermistor serviced or replaced

Three should be the coldest.

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air
How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

First, I think it’s important to know that the Ref side has no cooling coils, it’s basically a box and the cold air in the freezer is blown over by a fan through a channel into the Ref side. This channel has a door which regulates how much cold air goes through. You probably have two control knobs in the Ref side, one controls the temp with numbers 1-9, 9 being the coldest. This temp control tells the compressor how long to run. The other control is for that little door and it may have letters A-E, E being the coldest. If you set it on E (coldest) then this will close that little door and keep most the cold air in the freezer.

Now, why is that cold air not getting over to the Ref side?
1. The little door is not open.
check your control setting. You should be able to feel air coming through the channel on the Ref side.

2. The fan in the freezer is not working.
You can hear this fan running when you open the freezer.

3. The coils on the freezer side are clogged with ice which won't let the fan circulate the air over to the Ref side.
This is a failure of the defrost system.
You can melt this ice manually for a temp fix but the defrost system needs to be checked. Turn it off, take everything out of the freezer, use a hair dryer to warm the back wall. Do this for as long as you can without anything thawing then put it back in, turn it on and you will be good for a couple of days.