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Even with the prefix digits I cannot find any info on this unit.
Tried at AppliancPartsPros and the Sears site.
Please check it.
You said it had a defrost timer so try the following.
First remove the evaporator cover in the freezer so you can see the coils.
If they are heavily iced/frosted over then it is a defrost problem.
Do not let them de-ice.
If yes.
Manually force a defrost cycle by turning the defrost timer cam till the fans and compressor turn off.
There is usually a hole in the cover to let you do this without taking anything apart.
Now check the defrost heater to see if it is on.
Be careful you do not want to burn your fingers.
If the heater is on then the timer needs replacing, re: it is probably stalling during it's rotation so is never getting into a defrost cycle.
If not on.
Unplug the unit.
Remove the wire for one side of the heating element from the wiring and measure it for continuity, usually around 20 ohms or so.
If the heater is OK
Remove one wire to the defrost thermostat and measure it, should be 0 ohms when frozen. Note that it opens just above freezing so must be frozen to check it. Also inspect it, if it is bulged at all replace it even if it measures OK.
If both the above are OK then odds are the defrost timer contacts are toast.
Best way to test this is a live test to see if you have 120 volts across the heater/defrost thermostat combo.
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It does start with 596. Oops
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your model number looks incomplete.
Sear numbers are usually 3 digits, a period and then an additional 8 digits.
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Recently we've had an issue with our refrigerator cooling but not cold. I took the back panel off inside freezer and found evap frozen up. Let it thaw out and dried everything up. After that I noticed that after turning the knob for the defrost timer it would get cold for a couple of days then would warm back up. Replaced defrost timer and still having same issue.
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