Freezer temp too cold

Refrigerator & Freezer Repair
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1

Mornin

Freezer temp is too cold thermo is pegged @ - 20 F – unable to adjust temp

Fridge is ok –

2

I could not find any info on the given model number.
The following is for a KRS25ILBL13 (an i not a 1).
Replacement parts for Whirlpool KSRS25ILBT13 REFRIGERATOR | AppliancePartsPros.com

See the attachment for the tech sheet.

Following is a service manual. It does not list your unit so I am not sure how close of a match it is.
http://appliancejunk.com/forums/index.php?action=downloads;sa=downfile&id=215;t=1336391376

I would run the diagnostics in the tech sheet.
If OK then check the freezer thermistor for resistance.
If OK then odds are the control board is the problem.
KRS25i.pdf (709.7 KB)