Here is the parts breakdown
Replacement parts for WHIRLPOOL ET21GKXHN00 | AppliancePartsPros.com

See the attachment for the tech sheet.

This may also come in handy
https://secured.whirlpoo...50f068/$FILE/4322309.pdf

A little background.
-First off, everything has been inspected for ice build up and all passages inspected. Nothing is blocked. Coils and condenser area are clean.
I am assuming that you also checked the evaporator coils.

-Refrig part(bottom)works great.
I am confused on this see below.

-Defrost timer was replace approximately 6 months ago.
Did the fan run properly after the timer was replaced?
Has it ever run correctly?
It could be the timer was incorrectly installed but for the life of me I cannot figure how it could give the symptoms you report.

-The defrost timers stops moving(gears inside)at time when the compressor cycles.
This is normal timer is cumulative not continuous

-Circulating fan in back of freezer stays on all the time. Compressor comes on and off and seems to function very well with the thermostat.
It is supposed to according to the wiring diagram in the tech sheet.
Does the condenser/compressor fan cycle with the compressor?
If yes then you have a short of a mis-wire somewhere.

-At the recommended setting on the thermostat (refrig dial) the frig stays at about 30 degrees F. Turn it down, the frigs runs warmer and turn it up, the frigs runs colder.
Something is weird here, at 30 degrees F food would freeze in the fresh food compartment. Fresh food side should be around 40 degrees F.

-No matter where you put the dial on the freezer it seems to run around 20 degrees F until you get the frig colder than that. When the frigs goes below 20 degrees F then the freezer seems to stay right around the same temp as the frig.
This is also weird as the freezer should run at 0 to 5 degrees F.

-As stated above even when the compressor cycle off the circulating fan in the freezer stays on.
-The circulating fan stays on even when you turn the frig thermostat to the off position.
Both the above point to a problem in the wiring.

Where does the circulating fan get its signal to come on and off?
From the main thermostat through the defrost timer contacts.

Should the defrost timer stop(gears inside)at time when the compressor cycles?
Yes







A little background.
-First off, everything has been inspected for ice build up and all passages inspected. Nothing is blocked. Coils and condenser area are clean.
-Refrig part(bottom)works great.
-Defrost timer was replace approximately 6 months ago.
-The defrost timers stops moving(gears inside)at time when the compressor cycles.
-Circulating fan in back of freezer stays on all the time. Compressor comes on and off and seems to function very well with the thermostat.
-At the recommended setting on the thermostat (refrig dial) the frig stays at about 30 degrees F. Turn it down, the frigs runs warmer and turn it up, the frigs runs colder.
-No matter where you put the dial on the freezer it seems to run around 20 degrees F until you get the frig colder than that. When the frigs goes below 20 degrees F then the freezer seems to stay right around the same temp as the frig.
-As stated above even when the compressor cycle off the circulating fan in the freezer stays on.
-The circulating fan stays on even when you turn the frig thermostat to the off position.

I really believe the circulating fan should be coming on and off with the compressor. It seems to me it should not be blowing the cold air from the freezer to the frig even when the compressor is not on.

Where does the circulating fan get its signal to come on and off?
Should the defrost timer stop(gears inside)at time when the compressor cycles?

I do not know if I answered any questi0ns or just created more but something is very weird here.

On page 61, figure 75, inset 1.
-I don not have any "air return covers". There are just 2 square holes going through to the frig. You can stick you fingers from one compartment to the other. Is this normal?
The manual is generic so may not match your unit 100%
Later on you mention that the damper works so that area of the unit is probably OK.

-Replaced the defrost timer due to similiar problem, not sure if the problem was ever fixed. Freezer did seem to get to about 0 F for awhile. It was a simple plug in replacement, no wiring changes.
Has this unit ever worked correctly for you?

-Are you saying the fan in the freezer should be on all the time? I have a similiar unit (Kitchen Aid) that is basically the same. The fan in the freezer cycles on and off with the compressor. It also shuts off when the thermostat is turned off.
No, the freezer fan should shut off when the compressor and it's fan shut off

-No wiring mods have ever be done on this unit withe the exception of the defrost timer change out which was unplug/replug replacement.
Then I am stumped. I cannot see where that fan is getting power from.
All I can suggest is that you go through the physical wiring as show in the tech sheet to see if you can find the problem.

I would check the timer.

The Red (compressor and it's fan) and and the Red/White (evaporator fan) should be connected to the same timer contact.

If the Red/White is connected through the jumper to the Black then that is the problem.