Question about Amana ABB1924DEB / ABB1924DEW / ABB1924DEQ Bottom Freezer Refrigerator
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.
If this ice is not melted it will continue to build up until the air can't flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.
If the defrost thermostat is bad, it can prevent the heater from coming on OR it won't turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.
The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it's bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it's in the defrost mode.
you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls
Your control is part 5 in this diagram. http://www.searspartsdirect.com/partsdirect/part-model/Amana-Parts/Refrigerator-Parts/Model-ABB1924DEB/1268/0161000/M0608084/00003?blt=06&prst=&shdMod=
Posted on Oct 13, 2010
The most common causes for freezer icing up are, bad defrost timer, bad defrost heater, bad freezer thermistor, low refrigerant, defective evaporator fan and incorrect Temp. Settings and freezer door not fully closed.
The first thing is to defrost the evap. coil and then check for faulty components. to do this unplug unit form wall outlet, remove the evaporator panel and use a heat gun or hair dryer to melt all the ice built on the coil and air ducts. Have some towels handy in case the melting ice overflows the drain pan. Then check the mentioned components.
THE FOLLOWING ARE DIRECTIONS ON HOW TO ACCESS AND REPLACE THIS COMPONENTS, DO NOT REMOVE THEM UNTIL YOU ARE CERTAIN THAT THEY ARE DEFECTIVE.
Freezer Back Panel NOTE: Freezer compartment should now be empty and walls should be clear of anything that will obstruct removal of back panel. 1. Loosen screws that mount icemaker to freezer compartment walls. 2. Pull icemaker gently away from wall of compartment. As you do so, work fill cup free of fill tube. Unplug icemaker electrical connector and remove icemaker from unit. 3. (Pull out Drawer only) Loosen and remove screws that hold 2 basket glides in place at left and right sides of compartment. 4. If unit has no icemaker pry with flatblade icemaker connection cover. Remove cover. 5. Remove hex head screws that hold back panel and remove panel. 6. Squeeze tabs on ice maker plug to release it from back panel
Evaporator Fan, Evaporator Motor 1. Follow instructions in removing freezer back panel. 2. Remove screws that anchor evaporator fan bracket to back wall of compartment. Pull fan and bracket out of place as a unit 3. Free fan bracket from wiring harness by disconnecting wires to motor and wire in clips that go to defrost terminator. 4. Pull evaporator fan blade off motor shaft. 5. Separate bracket and motor by squeezing lower retainer bracket to release motor from bracket. 6. When reinstalling motor reference position of terminals of new motor the same as old motor.
Freezer Thermistor (some models) 1. Remove Thermistor cover located on the Evaporator Cover by inserting a screw driver in slot and releasing tab holding Thermistor cover on. 2. Unclip Thermistor from cover and cut wires to Thermistor. 3. Remove Thermistor.
Defrost Terminator (Thermostat) 1. Terminator is fastened to evaporator tubing with a spring clip. 2. Snap terminator off tubing and cut wires to terminator. 3. Remove terminator from unit.
Defrost Heater 1. Follow instructions in removing freezer back panel. 2. Remove hex head screws retaining evaporator to back cabinet wall. 3. Disconnect plugs from both sides of heater. 4. Release connectors from air dams on each side of evaporator coil. 5. Grip evaporator tubing at left and right sides and tug evaporator sharply forward. Evaporator will pop out of plastic clips that hold it to back wall of unit. Then roll bottom of evaporator forward and up, exposing evaporator heater in its location amid fins at bottom of evaporator.
Keep me posted!
Posted on Oct 12, 2010
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Posted on Jan 02, 2017
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