Customer Questions and Answers for Defrost Timer by Whirlpool

Sam, if the ice is forming a slab on the floor of the freezer, this would be from a clogged defrost drain that would need to be cleared. If the ice forming is like snow in a specific spot on the side, top, or bottom, this would be an air gap in the door seal that would need to be corrected.

Gryphon, Make sure that the timer is not in the defrost mode and if it is still heating then the defrost bimetal would be a likely cause.

Hello Bill, the manufacturer list part number WP3-81329 as the correct one for the model number. However if your unit currently has a different part number and works fine, you should be able to reuse that part. Thanks!

Bill, This is the replacement and the difference in the hour will not make a difference on your unit.

Benjamin, to test the defrost timer, make sure the freezer is in a cooling mode(compressor is running) then unplug the power cord. Access the defrost timer and disconnect the wiring harness from the timer. with a multi meter, place the meter probes across terminals 1 and 4, there should be a "closed" circuit. Then check across terminals 1 and 2, there should be an "open" circuit. Use a screwdriver or coin and turn the center escapement until the timer clicks twice. check for a "closed" circuit across terminals 1 and 2 and an "open" circuit across terminals 1 and 4 . If the timer checks proper, then the issue would be in the WPW10486820 / W10486820 heater asmb. or the wiring between the two components.

Annette, Your refrigerator [MFF2258VEW2] doesn't have a defrost timer. You would need to replace the WPW10503278 / 12784415V Electronic Control Board and program it, if it is the cause of the defrost problem. The part is in stock and available at this time. Thanks,

Hello Arlie. You need to look behind the grille in the front and in the back by the compressor. It should be in 1 of the 2 locations.

Hello Brian. You need to look behind the grille in the front and in the back by the compressor. It should be in 1 of the 2 locations.

Hello Emma. You will need to look on the frame of the back of the unit where the compressor is at. In most freezers, this is where they are located. If it is not there, then check the control panel in the unit. Thanks.

Hello Leo. The defrost timer will be located in one of 3 positions on this unit. You will want to pull the unit out and look in the compressor compartment, pull the kickplate off and look on the front of the unit behind the kickplate or will be located in the control housing.