Question about Viking Professional VCBB363SS Stainless Steel Refrigerator

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Need photo of Defrost Switch or Sensor

REPLY to "fixit 4 ya" - Checked continuity on heater coil using ohm meter and result was negative (no continuity). I guess the heater coil has a break which is why freezer is not defrosting. Is the defrost sensor the flat silver piece? How do you check if it is good? Ran ohm meter across it and its result is negative as well. I don’t know anything about refrigeration, but I’m guessing when the freezer builds up ice on the heater core the freezer temp either gets colder or warmer. Whichever it is the internals of the defrost switch will make contact and send current to the heater coil which then heats up and defrosts the ice. Once the temperature goes back to whatever the defrost switch is set for, the contacts will open thus turning off the heater coil. Is this how this system works? I haven’t read anything on defrosting so I’m just guessing.


SUGGESTION FROM fixit 4 ya -
Before replacing all of the components mentioned above, locate your defrost heater and check for continuity with an ohm meter,this will ensure no breaks in heater coil

Need photo of freezer defrost sensor, switch or thermostat Anyone have a photo, of the freezers defrost: switch, sensor or thermostat? Also, how to check if these parts are More
Anyone have a photo, of the freezers defrost: switch, sensor or thermostat? Also, how to check if these parts are working and how to order replacement part. Frost keeps building up even after manually defrosting. I removed the back plate and defrosted with a hair dryer twice now. After 3-weeks the frost builds up again. I have not seen any water in the defrost pan so the unit is not defrosting.

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Need photo of Defrost Switch or Sensor - moz-screenshot.jpg34f1f3f.jpg
Unit needs to be cold when you test. it closes at around 20 or 30 degrees F and opens around 55 deg F

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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I have a Maytag PTB1953DR refrigerator, would the timer be shot again?


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Fixya manuals


It doesn't defrost
  1. Defrost control board
If the defrost function is not working on your refrigerator it could be an issue with the defrost control board. This control board oversees several internal conditions and regulates the activation of the defrost cycle. A faulty board can be the primary reason your refrigeration unit is not transitioning to the defrost cycle. Over time, the buildup of ice on the evaporator coil will prevent the refrigerator and freezer from maintaining proper internal temperature. It is advisable to first check the defrost heater and the defrost thermostat for continuity prior to replacing the defrost control board.
  1. Main control board
A possible cause for a refrigerator not defrosting, especially on more modern units, is the main control board. The main control board acts as a "brain" for the unit controlling the defrost cycle, compressor, and run time, and essentially acts in place of the defrost timer. The control board can be tested using an ohm meter for functionality and will need to be replaced if bad.
  1. Defrost timer
If the refrigerator is not defrosting the timer could be malfunctioning. Numerous times throughout the day the defrost timer should cycle the defrost heater on as a means to melt frost buildup on the evaporator coils in the freezer. If this timer does not cycle on, then it may be faulty and require replacement.
  1. Defrost heater assembly
If your refrigerator is not defrosting accurately this could be an indication that your defrost heater assembly has failed. This could cause the frost to accrue on the evaporator coils, eventually blocking the airflow resulting in the unit not cooling properly. The defrost heater assembly can be monitored for continuity using an ohm meter and will need to replaced if there is none present.
  1. Defrost thermostat
Another cause of your refrigerator not defrosting is a faulty defrost thermostat. A requirement for the defrost heater to activate to melt away frost on the evaporator coils is a functional defrost thermostat. The defrost thermostat senses the temperature of the evaporator coils and initiates the thawing process by activating the defrost heater. If the thermostat is faulty, it will not sense the lowering temperature of the coils and will not turn on the heater, resulting in an advanced frost build-up. The defrost thermostat can be checked for continuity by using an ohm meter; if there is no continuity the damaged part will need to be replaced.
  1. Defrost sensor with fuse
Another possible cause of a refrigerator that does not defrost properly is a defrost sensor with a fuse. If the defrost sensor fails, the fuse acts as a one-time-only fail safe for the sensor -- if the sensor does not shut off the defrost heater, the fuse will blow when the set temperature is reached. This safety precaution is to keep excessive harm from your unit by the heater and is a one-time use, resulting in the replacement of the entire defrost sensor.
Defrost drain problems
  1. Clogged or freezing defrost drain
If you are experiencing defrost drain issues, it is possibly due to a clogged or freezing drain that is blocking water flow to the bottom of the freezer. This will cause the defrost water to drain and drip down to the bottom of the freezer section. To correct this issue, thaw any ice or remove debris that could be causing the clogged drain or replace the drain heater.
  1. Drain heater
If you are experiencing defrost drain problems, inspect the defrost drain heater. A dislocated or burnt out drain heater will result in the drain tube freezing over. Attempt to return the part to the designated position or replace the damaged part to correct the issue. Search Over 2 1 Million Appliance Parts

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Samsung RS265LBBP Defrost Thermostat


Try to check the thermostat by heating slightly with a hair dryer. It should give an open circuit once heated slightly. Have you checked the heater. You may have an open heater. Ohm out the heater it should give a reasonable low ohm reading. If the heater measures in the k or m range it is bad.
one other thing to answer your initial question. The thermostat is likely not the cause. If you have continuity that means power can go to your heater circuit.
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test this steps and fix it, use the VOM. God bless you

  1. Defrost control boardIf the defrost function is not working on your refrigerator it could be an issue with the defrost control board. This control board oversees several internal conditions and regulates the activation of the defrost cycle. A faulty board can be the primary reason your refrigeration unit is not transitioning to the defrost cycle. Over time, the buildup of ice on the evaporator coil will prevent the refrigerator and freezer from maintaining proper internal temperature. It is advisable to first check the defrost heater and the defrost thermostat for continuity prior to replacing the defrost control board.
  2. Main control boardA possible cause for a refrigerator not defrosting, especially on more modern units, is the main control board. The main control board acts as a "brain" for the unit controlling the defrost cycle, compressor, and run time, and essentially acts in place of the defrost timer. The control board can be tested using an ohm meter for functionality and will need to be replaced if bad.
  3. Defrost timerIf the refrigerator is not defrosting the timer could be malfunctioning. Numerous times throughout the day the defrost timer should cycle the defrost heater on as a means to melt frost buildup on the evaporator coils in the freezer. If this timer does not cycle on, then it may be faulty and require replacement.
  4. Defrost heater assemblyIf your refrigerator is not defrosting accurately this could be an indication that your defrost heater assembly has failed. This could cause the frost to accrue on the evaporator coils, eventually blocking the airflow resulting in the unit not cooling properly. The defrost heater assembly can be monitored for continuity using an ohm meter and will need to replaced if there is none present.
  5. Defrost thermostatAnother cause of your refrigerator not defrosting is a faulty defrost thermostat. A requirement for the defrost heater to activate to melt away frost on the evaporator coils is a functional defrost thermostat. The defrost thermostat senses the temperature of the evaporator coils and initiates the thawing process by activating the defrost heater. If the thermostat is faulty, it will not sense the lowering temperature of the coils and will not turn on the heater, resulting in an advanced frost build-up. The defrost thermostat can be checked for continuity by using an ohm meter; if there is no continuity the damaged part will need to be replaced.
  6. Defrost sensor with fuseAnother possible cause of a refrigerator that does not defrost properly is a defrost sensor with a fuse. If the defrost sensor fails, the fuse acts as a one-time-only fail safe for the sensor -- if the sensor does not shut off the defrost heater, the fuse will blow when the set temperature is reached. This safety precaution is to keep excessive harm from your unit by the heater and is a one-time use, resulting in the replacement of the entire defrost sensor.

Read more: http://www.appliancepartspros.com/repair-help/refrigerator-repair-help.html#9#ixzz2aX5nUL00
http://www.appliancepartspros.com

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Hello,

When a refrigerator will not defrost their are 3 components of the defrost system that could fail and won't allow it to defrost.

DEFROST HEATER ...remove back wall of freezer and you will see a black heater at the bottom of the coil thats frosted up,it looks similar to the bake element in your oven,or in some cases it is going to be a spiraled wires inside of a glass tube. To check it,use a multimeter set to the lowest ohms of resistiance setting and follow and find the wires at the top of that frosted coil,unplug/disconnect those wires and check for continuty with around 5-20 ohms of resistiance. If it has that amount of ohms the heater is good. If your meter display does not change or displays OL the defrost heater is broke and needs to be replaced

DEFROST TERMINATION THERMOSTAT... it's round and has 2 wires and clips to the top of that frosted up coil. IT MUST BE CHECKED WHEN COLD SO BEST TO DO WHEN FROST IS STILL BUILT UP. To check it disconnect the wires on it and check for ZERO ohms of resistiance. As with the heater if the meter display OL or doesnt change,it is the problem

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Need photo of freezer defrost sensor, switch or thermostat


Before replacing all of the components mentioned above, locate your defrost heater and check for continuity with an ohm meter,this will ensure no breaks in heater coil

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