Not defrosting the refrigerator could be a problem that needs to be fixed immediately. If you don’t want to call a technician, you can fix the problem by yourself. Most common solution - is to replace the fridge defrost timer. The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. If the defrost timer is defective, it may not advance into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle.The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. If the defrost timer is defective, it may not advance into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle. Just follow our instructions to replace the defrost timer in Sub Zero 532.
The fridge defrost timer is located on the right side of the control housing. To make the necessary repairs, you will need to access the components within the housing. Using the 1/4-inch nut driver, remove the two quarter-inch hex head screws located at the rear of the control housing. Next, remove the two control knobs and set in an easy-to-find place. To access the inside of the control panel, we'll need to take off the remaining two hex head screws which are located behind the escutcheon or face plate. The escutcheon is secured to the control housing by tabs. Slip the putty knife behind the escutcheon and gently pull forward, all the while being mindful of the tabs. After you have detached the escutcheon, support the control housing with one hand while removing the remaining two quarter-inch hex head screws with the nut driver. Like the others, these screws have washers attached, but they are much smaller. Set them aside. Carefully lower the control housing while avoiding pinching the capillary tube that controls the coldness of the fridge or breaking the damper control, both of which runs along the sides of the housing. The frost timer for the fridge is located on the right side of the control housing. It's secured in place with two tilt screws. Remove them using the Philips screwdriver and then disconnect the four-pin plug attached to the defrost timer. Make special note of the colors of the wires. Locate the timer mode wire and terminal, and then force the wire over the speed terminal. Afterwards, connect the new fridge defrost timer to the plug. Press firmly to ensure a snug fit. If your previous timer used Philips screws, you'll need to replace them with the 1 1/4-inch slot head screws. If necessary, enlarge the holes a little to accommodate the size of the screws. To finish up the repair, realign the control housing and screw in the two quarter-inch hex head nuts with small washers to secure it in place. Replace the escutcheon, starting with the bottom and then the top. Put the knobs back in, and then screw in the last two quarter-inch head screws with large washers.
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