WARNING: Mercury is toxic when inhaled or ingested, so proceed with caution before handling it. All rights reserved. problems contact webmaster@doityourself.com. The electronic control board monitors temperature sensors to control freezer temperature and the defrost cycle. However, if after 20 minutes the freezer still has not begun to defrost, then you will need to remove the back wall, and look at the thermostat itself. The defrost heating element melts frost from the evaporator fins to improve cooling. There are many signs of a failed refrigerator defrost timer. All information is provided "AS IS." If the compressor runs but doesn't stay on long enough to keep the freezer compartment at 0 degrees, you may need to replace the cold control thermostat. If the evaporator fan doesn't run when activated, replace it. Have a service technician replace the compressor, because this repair requires access to the sealed refrigerant system. On most refrigerators, the coils are behind the bottom front grill. Questions of a Do It Yourself nature should be A defective defrost bi-metal prevents the defrost heater from working, causing frost to build up on the evaporator, causing a warmer freezer interior. If the defrost heating element fails, excessive frost covers the evaporator fins. Copyright© All Rights Reserved, How to replace a freezer defrost thermostat, How to replace a freezer electronic control board, How to replace a freezer temperature control thermostat, How to clean refrigerator condenser coils, How to repair broken or damaged wires video, How to use a multimeter to test electrical parts video. While the wires have been removed, you can also examine them for signs of damage. Lubricate the door seal with a light coat of petroleum jelly occasionally to prevent air leaks into the freezer. The cold control thermostat, located in the control housing, regulates the freezer temperature by cycling the compressor on and off. The sensor bulb on the cold control thermostat monitors freezer temperature. Keep track of the models you own in your profile. Follow the instructions in your owner's manual for cleaning the condenser coils. Dust-covered refrigerator coils can prevent the refrigerator and freezer from running efficiently and cooling properly. submitted to our "DoItYourself.com Community Forums". If your freezer isn't cold and you don't hear the fans or compressor running, the electronic control board could be the problem. Connect your probes to the thermostat, and turn it on. If the cold control sensor fails or the internal contact inside the cold control isn't sending current to run the compressor, the freezer won't cool. Some of these are an inability for the refrigerator to go into a defrost cycle and revert back to cooling, the refrigerator defrosts all of the time, or the refrigerator doesn't defrost any time. A faulty relay on the electronic control board can also prevent the control board from sending power to the compressor. If the freezer still does not start to defrost, you may have to replace the thermostat completely. Also, check the condenser coils to see if the coils are dirty-dust on the coils can prevent air from cooling the refrigerant. Once the thermostat has failed the Ohms test, then you should check the connections at the back. This easy-to-follow repair guide and video show how to replace a freezer thermistor. A failed condenser fan motor can inhibit freezer cooling because air doesn't move across the condenser coils to cool the refrigerant before the refrigerant enters the evaporator. I have Honeywell T8000C thermostat. Replace the defrost heating element if it's damaged or not heating. Replace the thermistor if it's not sensing freezer temperature accurately. Routine maintenance keeps your freezer working efficiently. This can sometimes come out of alignment, and will need to be re-set. However, from time to time, these devices can apparently fail, and cause problems which include leaks upon the floor, a warm refrigerator portion, or a freezer section which has ice forming across the back. to this site, and use it for non-commercial use subject to our terms of use. This DIY repair guide shows how to clean the refrigerator condenser coils in 4 easy steps. It moves air across the condenser coils to help cool the hot refrigerant coming out of the compressor. When the thermostat has a consistent reading, you should see a Ohms setting of 0. View our Privacy Policy here. The control board activates the compressor to keep the freezer cold and runs the fans. A failed evaporator fan motor can also prevent the freezer from cooling well because cooling air won't circulate through the freezer compartment. Using your pliers, turn the nut on the mercury screw until the connection pops out. A faulty compressor won't compress the refrigerant in order to cool the freezer properly. If your freezer isn't freezing, the temperature control thermostat could be to blame. The defrost thermostat on your fridge is an important piece of equipment which prevents your freezer from becoming too cold. When it trips, the defrost bi-metal shuts off the defrost heater. Unplug the refrigerator before accessing and cleaning the coils. This repair guide and video show how to replace a freezer defrost thermostat with step-by-step instructions. Use the advice and tips in these articles and videos to get the most out of your freezer. Anything more than that, and the thermostat is defective. Troubleshooting a Chest Freezer That Doe... Troubleshooting a Chest Freezer That Doesn't Cool. If your freezer is warm and you don't hear the hum of a fan, the evaporator fan could be broken. Turn off your power, and then remove the wiring from the thermostat, and connect them to your defrost heater. The defrost thermostat on your fridge is an important piece of equipment which prevents your freezer from becoming too cold. If this is your problem, then you should immediately place the defrost timer onto manual defrost. You can check the connections are not corroded, and also pass some paper along the surface of the connectors, as this will clear away any dirt. The thermistor is a temperature sensor inside the freezer. This should be stuck to the evaporator coil. Freestanding freezer returning an error code? To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. Join our email list for updates and offers. This should automatically trigger a warming of the freezer section. Clean the bottom front grill and the condenser coils regularly to help the freezer cool better and use less energy. Does the ice cream in your freezer seem too soft or the beverages in your refrigerator not cold enough? Common issues include erratic behavior from the thermostat or even complete malfunction. If your freezer is too cold or not cold enough, the thermistor might be to blame. The compressor is a pump that an electric motor rotates. The evaporator won't be able to cool the freezer well when the evaporator cooling fins are caked with frost because the frost blocks air passages over the fins. The electronic control board-also called the main control board or the power control board (PCB)-manages the compressor and the defrost cycle. You'll typically see frost on the evaporator cover when the defrost system isn't working because the defrost heater isn't turning on to melt frost off the evaporator fins. However, from time to time, these devices can apparently fail, and cause problems which include leaks upon the floor, a warm refrigerator portion, or a freezer section which has ice forming across the back. Replace the thermostat in the freezer, and test the defrost timer again.

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