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Defrosting timer is not working correctly??

The defroster was not working and my father found that the timer didn't seem to come on at the correct intervals nor run for as long as it was suppose to. It was a continuous timer that was set for 8 hour intervals and would run for 21 minutes. It cut on here and there and would run for 5 to 20 minutes max. He replaced it.

Now every time the compressor kicks on, the timer goes off.

He said the new timer was slightly different but was the replacement for the old one and looked like the wiring was the same.

Any ideas??

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On most refrigerators the timer is only supposed to run when the compressor is on. It sounds like your replacement timer is incorect, and wired differently. Hope this helps!

Posted on Feb 05, 2009


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I have a paragon 8145-20 defrost timer. do you wire the compressor to the timer? I cant seem to find a wiring diagram on how to wire this correctly

Link below has wiring diagrams and wiring manuals for 240V 8145-20

I am not expert installing defrost timers.
According to information from Paragon, 8145 is for hot gas defrosting. 8140 series are time initiated, and pressure-or-temperature terminated.
Wiring diagram does not show compressor wired to timer.

The cycle works like this:
Timer is running but defrost is not switched ON.
Fan is ON.
Timer switches ON and activates defrost cycle.
Fan turns OFF. Hot gas valve turns ON for defrosting.
Cycle limit switch is temperature or pressure sensitive.
Cycle limit switch reaches trip point, timer switches OFF.
Hot gas valve turns OFF. Fan turns ON.
So fan is off during defrost cycle.
Hot gas valve turns ON when timer switches ON.
Timer is switched OFF by pressure-or-temperature limit switch.

Dec 09, 2010 | Paragon 8145-20 Defrost Timer

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Top mount freezer drain keeps freezing up causing water to collect in refrigerator compartment. Drain is not clogged until it freezes.

Check the Evaperator Fan in freezer for correct operation low air flow will cause the problem. Check defrost timer, heater and limit thermostat, If it is not defrosting correctly it will cause the problem.

Mar 29, 2010 | Kenmore 21.7 cu. ft. Top Mount...

1 Answer

Refridgerator not cold

Hi and welcome to Fixya. When a food section of a refridgerator warms up it is a sign that the unit is not defrosting or there is an air flow problem.

This can be caused by the following components:

1. The defrost timer
2. Defrost bi-metal 60 Deg thermostat
3. Heating element
4. Evaporator fan failure in the freezer compartment

Sometimes the defrost timer will just stop advancing for some reason and ice builds up in the evaporator coils that restircts airflow from the evaporator fan so the food section warms up.

The most likely failure is the defrost timer.

You can see if your uint will cool properly after a good defrosting by doing this:

1. Unplug the unit and unload the freezer section
2. Place a fan blowing into the freezer for about 2 hours. (it will make a water mess so be prepaired)
3. Plug in / restart the unit and monitor the temperature for the next 48 hours (it should be normal or near normal) After 48 hours the food section temp will start to raise again due to ice build up.
4. If the temps return to normal then the unit is not defrosting properly and will need repaired.

You can find replacement parts here:

From the model number you gave the defrost timer is Item 6 of the control diagram

It can also be found here:

I did not of course diagnose the unit in your home. The part above is the most common failure. Given the cost of the defrost timer I would make SURE that it was defective before ordering.

In order to perform a continuity check of the rest of the defrost system components the bi-metal 60 Deg F thermostat must be above 60 Deg (or jumpered) to read the whole circuit. Jumpering the 60 Deg thermostat will not verify it is working correctly.

Hopefully this gives you a bit more understanding of why your unit is warming up in the food section.

Feb 04, 2010 | Refrigerators

1 Answer

Whirlpool stopped blowing cool air. Unplugged

It sounds as if your defrost timer has failed. Unplugging the unit over night allowed the unit to defrost. If unplugging it overnight or by using a stnd fan blowing into the freezer section for 90 minutes results in the fan blowing cold air then your unit is not defrosting. Most often the defrost timer is the problem. However there could be other defrost circuit like the thermostat or the defrost element. In order to provide you with the correct solution and defrost timer location you should privde your model number for further instructions.

Jan 02, 2010 | Whirlpool 21.0 cu. ft. Top Freezer...

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I have a Estate bran fridge and it keeps defrosting every two days it's a new fridge what could be the problem

HI. This will occur if your defrost module is malfunctioning. There are two types of defrost controllers. The first will be an adaptive control board. This will be located in the control housing, just above the heat shield, in the upper right had side. Older models will have a standard defrost timer mechanism. When these devices are malfunctioning, You will notice erratic defrosting cycles. I recommend to inspect the module, to confirm that it is set correctly, and is operating.

If equipped,The defrost timer is usually found behind the front grill "toe kick" 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. It will have an adjustable dial. make sure it is set to a proper defrost interval.

NOTE_ If your unit is equipped with an adaptive defrost control board, and the defrost cycle is erratic, this will require you to replace the board. this type of defrost control module is not repairable.

Nov 10, 2009 | Refrigerators

2 Answers

Ice is building up in the freezer, all else seems to be working OK. Food has ice all over it.

If your Fridge is a "no-frost" or self-defrosting unit, it could be that the auto defrost timer and/or defrost heater element has failed. The first thing to check, if all other functions seem to be working, is the defrost heating element. This can be done fairly easily by removing all contents of the freezer and removing the access floor (top freezer style), or the other panels (side-by-side style) to see the defrost element. You can check online for a diagram of your particular refrigerator model to see the exact location of the defrost element and how to get at it.

If the element can be checked with an ohm meter, (unplug AC power cord to fridge 1st!!!) you might be able to quickly determine that the element has failed, sometimes you can actually see a break in the element, but usually, you need to check for continuity to determine if it's good or bad. Rarely, I've found a loose connector on the element causing intermittent defrosting, but it is rare these days in the manufacturing process/testing.

If the defrost element is bad, via test, then the likelyhood that is the problem. Get a new one and re-install and you should be OK.

Otherwise, it MIGHT be the defrost timer, but experience has shown that the defrost element is prone to fail more often than the timer unit.

Jul 07, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

2 Answers

Freezer not freezing

your defrost timer or defrost heater could be bad,

May 20, 2009 | Refrigerators

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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
14 degrees f.

Jan 19, 2009 | Kenmore Freezer 20.3 cu. ft. Frost Free...

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Amana arb-190zc not defrosting

Im sorry, its not defrosting? I suppose you have unplug it, it will defrost eventually.

Jul 28, 2008 | Amana Refrigerators

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