Question about Maytag MSD2756G Side by Side Refrigerator
Hi and welcome to FixYa, I am Kelly. Not defrosting can be caused by component failure.
Those components being:
1. The adaptive defrost control (Item 13 this link) http://www.appliancepartspros.com/partsearch/model.aspx?model_id=48135&diagram_id=665424#d665424
You can manually initiate a defrost cycle by shorting L1 to test on the adaptive defrost control board for 3 seconds. You should hear a relay click, the compressor and evaporator fan will shut off and the defrost cycle will start. If after about 45 minutes the defrost cycle does NOT terminate then there are other problems. See adaptive picture here for terminal locations: http://www.applianceaid.com/image/mayadaptive-defrost2.jpg
2. The defrost element is open. ( Item 12 this link)
You can check this by reading resistance between the yellow and the White / Black wires on the adaptive defrost connector. No resistance = open element.
3. The defrost thermostat. (Part of Item 12 assy above)
With power off this is checked for 340K ohms or less reading between White Black and Red wires on the adaptive defrost control wires.
4. A slow or NOT running evaporator fan. Resistance of the motor winding is checked from the BLUE wire on the temp control to the orange wire on the adaptive defrost control. It will read around 180 Ohms.
The only other thing that can cause problems is a clogged evaporator drain. If it is defrosting though it will cause water to leak out the door of the freezer compartment at the bottom left.
It is going to take a meter to sort out which of the 3 components has failed. Let me know if you need anything more.
Thanks for choosing FixYa,
Posted on Oct 15, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Sep 06, 2014 | GE Monogram ZIRS36NM 36'' Stainless All...
Nov 02, 2013 | Samsung RF4287HARS French Door...
Jul 30, 2013 | Refrigerators
Apr 01, 2013 | Whirlpool Refrigerators
Jan 08, 2013 | Refrigerators
Sep 26, 2011 | Refrigerators
So first thing you try is , perform, manual defrost reset procedure.---------
The manual defrost reset procedure is as follows : ----
First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. Then check,if same frost is getting collected, then its defrost problem,. If it's again building up ice that means the unit is not defrosting. It's starting the cooling procedure, and then while defrosting, it's not working. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. IN YOUR case, defrost thermostat is already got replaced, so ignore thermostat, but other two possibilities needs to be checked.----------You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.
Sep 19, 2011 | GE Refrigerators
When the refrigerator is running ( cooling mode ) the defrost timer contacts
prevents any power from getting to the defrost heater. When the defrost timer
turns off the power to the compressor and fan motor(s) the power is then
redirected to the defrost system. The defrost timer
During a defrost cycle, the defrost heater causes the metal alloy in the switch to warm and as it does it curls back and breaks the circuit. As the metal cools, it makes a closed circuit again. A defective thermostat can prevent the defrost heater from coming on or allow it to overheat which could result in heat damage or fire.
The defrost thermostat is located near the defrost heater and is wired in series. It is usually located at the back of a side by side freezer, behind the freezer back wall of a top freezer or under the floor. It will be necessary to remove obstructions such as the contents of the freezer, freezer shelves, icemaker and the inside rear or bottom panel of the freezer. At room temperature the defrost thermostat is an open circuit ( no continuity ) and when cooled down the defrost thermostat closes the circuit ( has full continuity ) to allow the defrost heater to come on.
The defrost timer is sometimes found behind the front grill of the refrigerator. It may also be found behind a cover plate inside the refrigerator or freezer, in the temperature control console, or behind the refrigerator near the compressor.
The timer is usually held in place with one or more screws. Remove the screws and gently pull the timer out far enough to disconnect the wiring connector.
Locate the timer switch and turn it
clockwise until you hear it click.
One click and the refrigerator shuts off = defrost mode, second click the
compressor and fans come back on = run/cooling mode.
*Some defrost timers are a constant or continuous run timer, which
means when ever the refrigerator is plugged in the defrost timer is powered up
and running. Some defrost timers are an accumulative run timer, which means when
the refrigerator is off the defrost timer is off and not running, when the
refrigerator is running the defrost timer is running. This is also sometimes
called a demand defrost. The power for the defrost timer goes through the cold
control first on an accumulative defrost system. The timers are often the same
but will be wired differently to get the different operations.
Test the heating element for
continuity using a multimeter. Set the multimeter to
the ohms setting X1. Place a probe on each terminal. The multimeter should
display a reading somewhere between zero and infinity. Because of the number of
different elements we cannot tell what your reading should be, but we can be
certain of what it shouldn't be. If the reading is zero or infinity the heating
element is definitely bad and should be replaced. Proper power ( careful!! ) to
the heating element ( 110-120 volts AC ) and the defrost heater does not come on
= bad defrost heater.
Some newer refrigerators have been
using an electronic board instead of an mechanical defrost timer. The adaptive defrost control does the same job as the
defrost timer ( shuts off the refrigerator cooling items and redirects the power
to the defrost heater for the defrosting cycle, then redirects the power to the
compressor and fans to come back on when the defrost cycle is over ). This
adaptive defrost system is a bit different when testing, normally speaking if
the defrost heater and defrost thermostat ohm ok, we replace the adaptive
Nov 28, 2010 | Frigidaire Refrigerators
Most times after manually defrosting the defrost heater on your model can be seen burned out
by just looking at the outer glass of the heater itself. This takes unplugging the refrigerator and removal of the rear panel inside and back wall of the freezer
Most times after manually defrosting the defrost heater on your model can be seen burned out Testing the defrost heater can be found here=>WR51X10055 Defrost Heater Assembly Once inside the freezer it is always a good idea to change the defrost thermostat, Click Here=> WR50X10054 Defrost Heater
Sep 28, 2010 | Hotpoint HSS25IFMCC / HSS25IFMWW Side by...
138 people viewed this question
Usually answered in minutes!