Ive replaced the ADC on a MZD2768GEB refrigerator. A week later, the coils are still freezing over, and the refrigerator side is getting warm. The thermostat has continuity when it's cold, however there is no ohm reading when it is open. Should it show no resistance reading, or would this indicate a bad thermostat?
Answer Hello Jon,
It is testing properly if it shows no resistance when cold and open when warmer, (50°F and warmer). When it opens, it is opening the circuit to the defrost heater so it cannot thaw out the frozen foods in the freezer compartment. As a note, the defrost circuit cannot thaw out all of the ice built up during a long duration with no defrost cycle. This ice has to be removed with a hair dryer or steamer. The defrost heater can only melt away the amount of ice built up between normal defrost cycles. You should test the defrost cycle by forcing a defrost cycle before opening the unit. This way, by the time you get into the evaporator coils where the heater is, it will be hot and you can verify the heater is coming on. As soon as you verify it is operating properly, unplug the unit and clear the ice build-up.
ice builds up in bottom of freezer and it slowly keeps leaking onto the flour.i was thinking heater asyembly but thought id ask you before buying one. thank you Eddie
Answer Eddie, If it were a defrost problem, there would be frost or ice higher up the freezer back wall. It sounds more like a clogged defrost drain opening or tube. You'll need to remove the freezer back wall and remove the ice from the drip pan, and check and clear the opening and tube.
Freezer freezing up.
Answer Hello Roy. It sounds like you may have a defrost problem with the unit. Check and see if there is any frost build up on the evaporator coils in the freezer. If so, you will need to test the defrost heater and the defrost thermostat. They should read closed for continuity when cold. You can test this with a multi-meter TJMA-DMT3. I will include a link at the end to assist you how to use the multi-meter if needed. If both parts are good, you will need to replace the defrost timer. Once the problem is repaired, you will need to thaw out the ice on the coils before the unit will operate properly. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html
Opened frig this morning, spelled burnt plastic and temp was up to about 50deg. Freezer section seemed normal temp. Coils looked OK, slight amount of frost. Light bulb in lower section had burst, the housing had melted a bit. We assumed cause of the melt/burst was the door was left open, though we cannot seem to reproduce any condition which would cause the door to remain open. Checked the defrost thermostat/heater: reads normal (short) when cold. We're defrosting the frig now. Suggestions?
Answer Richard, A few things to check, look at the lower hinges and door closer assemblys, make sure they're not worn or "dragging" (you may want to lubricate the assembly with some grease). Check the refrigerator for level in both directions, then raise the front feet 1/4 inch. This will help in closing and sealing the doors. Make sure there is nothing protruding from the door bins or shelves, and make sure the lower vegetable bins are closed completely. It takes very little to keep the doors from closing properly and sealing.
The ice build up on the freezer coil is the same as many of the questions here. I am replacing the Heater assembly now but need to know where the timer and thermostat is located.
Answer Hello Phil! The defrost thermostat is located on the defrost heater. When you purchase the heater assembly 61006199 you will also receive the thermostat. The defrost timer is an adaptive defrost board 61005988 on your unit and is located in the control area. Thanks!
The refrigerator and freezer both got warm. Ice formed on the back of the freezer. I unplugged it for a day and then plugged it back in. It ran fine for a week and then the same problem occurred. Which part do I need to replace?
Answer Hello Bill,
This is a defrost issue. You will need either a defrost heater and thermostat assembly 61006199, or an electronic defrost control 61005988. On this model, the electronic control is the common part to fail. Be sure, after you install the part, defrost the unit with a hair dryer. The defrost circuit is only equipped to handle the frost build-up from one cycles worth of frost. It cannot defrost two weeks worth of ice build-up and the unit will still not operate properly with the frost build-up blocking the air flow through the coils.