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I have an old Kelivinator 480 frost free (ne480s) with a defrost problem. I have replaced the timer and heat element and both are working but the coils in the freezer remain iced up which is causing the fridge to run warm. I am thinking it could be a problem with the hot gas solenoid but I do not where to find it or how to replace it. Any suggestions would be greatly appreciated. Happy days Dave

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The only thing that you haven't replaced is the defrost thermostat, clipped on evaporator line, I would try that

Posted on Sep 07, 2010

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1 Answer

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You might have ice building up on your evaporator coil. That ice serves as an insulator and prevents the internal freezer temps from going down to design parameters. The ice buildup is caused by the defrost mechanism not working - check the timer or the defrost heating element.

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Hi, The defrost heater may not be working properly (timer stuck, heating element burned out, bad defrost thermostat,etc.). The unit should go into defrost mode about every 6-8 hours typically and last about 30 minutes (depending on model of freezer). During defrost cycles the compressor and fan do not run (don't want to keep cooling while trying to defrost). Once defrost is over, the fan and compressor get power again.
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Sounds like the defrost system of your freezer is not working. It could be either the defrost timer, defrost thermostat or the heater has a problem. The defrost timer turns off the compressor periodically to sent power to the defrost heater via the thermostat. The defrost heater then powers up and heats the evaporator coil to melt the accumulated ice buildup on the cold coils. Most likely issues are that the timer motor is not advancing the timer or the heater itself has burned out.

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My zanussi frost free freezer, about ten yrs old, keeps frosting up and causing fan to be very noisy. How can i solve this?


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Mar 18, 2010 | Freezers

1 Answer

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If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow.
You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model
thumbs up

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You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model

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1 Answer

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If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow.
You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model

Aug 13, 2009 | Freezers

1 Answer

In addition to the popping noise/coils are froze with orignal


turns out the coils were not defrosting or at best working intermittently. I defrosted the coils and ordered a defrost timer the old timer continued to pop from intermittently.I replaced the defrost timer
and it quit popping and noew the freezer works fine temps range between 9 degrees F and
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If its freezing at the back that indicates refrigeration is good. it sounds like you have a thermostat control problem. Replace the thermostat.

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1 Answer

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the tech was telling you to put it in defrost and if ater the time you didn't hear the click the defrost timer is defective but like you are describing the defrost thermostat (bimetal) could be bad. here's a simple test (if your handy with a screwdriver) just dissasemble the panel and you will see the coil and defrost heater. if your handy with a voltmeter (please disconnect power first!) locate the two wires to the defrost element put the meter in "audible" mode and check for continuity on the defrost heater if you hear a beep it's good if it dosen't beep it's bad just replace heater w/ bimetal and your ready 2 go! email me @ hvac.tech7872pr@gmail if you have any questions

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