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Refrigerator not defrosting and evaporator motor not running! I have 115v power to fan?

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  • stevenm06 Jun 08, 2009

    Nice Try, With the refrigerator and compressor running the evaporator fan is not working! I checked power to the fan and it showed 115 volts and is not defrosting and evaporator is solid with ice! I took the fan motor out and plug it to a outlet which has 120 v and it worked! This is a samsung refrigerator bottom freezer! It has a main control board! Any Ideas?



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you have a defrost issue not being able to verify circuits on the mother board i would replace the high limit, what you are calling the termination stat this stat stays closed unless the temp hits 140, thats right 140 degrees f and change the evaperator sensor.
evap sensor can cause missed defrosts or no defrosts
high limit part number wr50x10068
sensor number is wr55x10025

Posted on Jun 09, 2009

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chek this sites to ve an indepth knoledge

1. The evaporator fan should only be on when the compressor is running.
Not when the fridge is in defrost.

2. it would be best to check for 120 volts while the fridge is on and not in defrost.

3. There should be a light amount of frost on the cooling lines.
But if the fan isn't working then there will normally be more frost then you would usually see.

If the fan is getting 120 volts while the fridge is on then you will have to replace the Evaporator Fan Motor


Try removing the access panel in the freezer section to expose the evaporator coils. If the coils in the freezer section get clogged with frost, it will block the evaporator fan motor from blowing the cold air. The fan blade could also hit the frost and become noisy, or stop altogether.
You can locate the defrost timer, but it can be tricky, since they are often hidden behind the back bottom corners of the fridge. In the last few years the timers have been located in the ceiling of the fresh food section, and some behind the cold control cover. Once you locate the defrost timer, slowly turn the screw-like wheel, in the middle of the defrost timer, with a screwdriver until the fridge shuts off. Now the fridge is in defrost mode. If the defrost heater comes on now, replace the defrost timer and defrost thermostat. If the heater does not come on, you can ohm test the defrost heater for continuity or volt test for 120 volts to the heater. If you have no power to the heater, you can also bypass the defrost thermostat to see if the heater will come on; join the two wires together, to bypass the thermostat. If the heater now comes on, replace the defrost timer and defrost thermostat. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater and defrost thermostat. If the defrost timer seems "hot" to the touch or is noisy or ticking, replace it.

chek this link too

Hope u will b helpfull

Posted on Jun 04, 2009


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I have a side by side whirlpool fridge and the freezer is fine but the fridge is now freezing everything. It's about 11 years old.

Since you stand to loose all the food I would call a service tech ASAP. But here are the most common reasons for the problem you have.
Cause 1
The Evaporator Coils are Frosted Over The defrost heater assembly turns on a few times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, frost will continue to accumulate on the evaporator coils, and the coils will become plugged with frost. If the evaporator coils are frosted over, the airflow through the coils will be restricted, causing the refrigerator not to cool. Check the evaporator coils to determine if they are frosted over. If the evaporator coils are frosted over, test each component of the defrost system.
Cause 2
Evaporator Fan Motor The evaporator fan motor draws cold air over the evaporator coils and circulates it throughout the freezer. If the evaporator fan is not working, the freezer or refrigerator will not cool adequately. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, replace the fan motor. Additionally, if the motor is unusually noisy, replace it. Finally, if the motor does not run at all, use a multimeter to test the motor windings for continuity. If the windings do not have continuity, replace the evaporator fan motor..
Cause 3
Damper Control Assembly The air damper control opens and closes to let the proper amount of cold air into the refrigerator compartment. If the damper does not open properly, it won't let enough cold air into the refrigerator. Check the damper control to determine if it is broken or stuck closed.

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1)check the temperature should be set on normal mode. 2) check if the ventilation in the fridge are blocked .there are two possibilities you will have to check 1)the defrost timer 2)the evaporator coil. How a common frost free defrost cycle works and the main parts. 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 motor. Defrost timers:
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.
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the evaporator coils are located at the inner side of the freezer section.if the ice gets collected in the coil and the evaporator fan stops running then the inner system of refrigerator will get over cool and this problem happens.
now to solve the issue .if to check evaporator coil is faulty or not there is a system.just unplug the unit from main power outlet then wait for 24 hours.then replug the power cord in the main power 24 hours all the ice collected in between the coil and anywhere will get melted and then check out.if it works properly the problem was ice in coils.but if same problem then defrost timer needs replacement,you can get new timer friom

This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

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