Question about Whirlpool ET8WTKXK Top Freezer Refrigerator

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Will not defrost on its' own. how do I detemine what is wrong; system includes a timer, a limit switch and heater. Is there a way I can manually start the defrost cycle and verify the "heater" is working, or see if the timer is failed.

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  • Anonymous Mar 16, 2014

    defrost heater thermometer timer fail

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Good day,
Yes you can. First with a small bladed screw driver, turn the shaft of the timer clockwise while the machine is running. Wait 35 minutes, if the timer turns the machine back on, it's O.K. If not, it's defective and needs replaced. If it checks O.K. then it has to be either the limit thermostat or the heater. 90% of the time it's the limit, however, check the heater first. Remove the wires, and using an ohm meter test the heater for continuety. It should read less than 35 ohms. If it checks infinity, it burned out and must be replaced. If O.K. then just change the limit thermostat. It's the only item left that could be causing the problem.

P.S. It is standard proceedure to replace the limit thermostat if the heater checks bad. Replace both at the same time. If the limit checks bad, replace it only.
Jack...

Posted on Jul 13, 2010

Testimonial: "Thanks for the help, tested my timer, and was able to determine the issue was the clip on defrost thermostat; a $28 part. Saved me a service call!!"

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The unit I'm working on has a 1 month old 8145-20ex and now the unit wont go into defrost - The compressor and the evap do not stop and the heaters do not energize. I'm thinking the defrost termination...


Copy following links:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#8145
http://waterheatertimer.org/pdf/How-to-test-Paragon-8145-timer.pdf
8145-20 is 240Volt defrost timer.
The defrost cycle will not begin. This implies that trippers are not in place, or trippers are worn out.... or limit switch is stuck ON or solenoid inside timer has gone bad.
Test across terminal N to X for 240Volt. Because voltage here will stop defrost cycle by activating solenoid inside timer, but continuous voltage will also stop next defrost cycle from beginning. Disconnect wire on terminal X and see if defrost cycle will begin at next tripper. If defrost begins, then limit switch is bad.
Gene
h

Aug 06, 2013 | Hardware & Accessories

4 Answers

Ice develops at back of fridge


hi chris
dave here hope i can help

I would test the defrost timer, defrost heater or defrost limit switch

TESTING AND REPLACING THE DEFROST TIMER
This timer activates the heater that melts frost in the evaporator for 10 to 20 minutes every 10 to 12 hours. In the process, it turns the compressor off and on. If it fails, the compressor may not run. Or the heater may not go on, eventually causing a hidden ice buildup that blocks the cold-air flow and disables the evaporator fan. An access hole lets you test the timer. If the timer isn't in the control panel, look behind the front grille or behind the rear access panel. If the compressor fails to run turn the timer until it clicks. If compressor goes on, timer is faulty. If unit isn't defrosting automatically and turning timer stops compressor or fan, timer is faulty.
Before replacing timer, spray it with electrical contact cleaner through access hole and turn it a few times. Stop just before a click and wait to see if timer advances on its own.
To replace timer, unplug the refrigerator and open control panel. Remove screws holding timer to panel and pull of leads. If wires aren't in a plug, move then one at a time to new timer.

EVAPORATOR AND DEFROST HEATER
In a frost-free unit, the evaporator coils, their fan, and the deforst heater are located behind the freezer's back wall or under its floor. The fan, which circulates cold air between the coils and the two food compartments, is controlled by the door switch, the thermostat, or both. To check the fan, open both doors, wait for the compressor to go on, and hold in the door switch. If you can't hear the fan running, test the fan(below).
The defrost heater, which melts frost on the coils, is cycled on by the defrost timer(above). If the frost melts before the end of the defrost cycle, the defrost limit switch turns the heater off. The heater may be a metal rod, a wire wrapped in foil, or a coil inside a glass tube. All are tested the same way. Test terminals for the heater are often located in the control panel or under a doorjamb; check the wiring diagram. Or test the heater leads inside the evaporator compartment.

TESTING THE EVAPORATOR FAN
To remove the evaporator fan, unplug unit; open back panel(or floor) of freezer. Then unscrew housing holding fan, and take off leads going to fan motor. With VOM(Volt-Ohm Meter) on RX1, probe motor terminals(except green ground wire terminal). Look for moderate resistance(50 to 200 ohms). Replace fan if much lower or infinity.

TESTING THE DEFROST HEATER
Open control panel. With VOM on RX1, probe test terminals. Look for 15-to 100-ohm reading. If infinity, turn defrost timer(as above); retest.

TESTING DEFROST LIMIT SWITCH
Trace and disconnect leads. With VOM on RX1, probe leads. Look for infinity reading when switch is warm, zero after 20 minutes in working freezer.

Hope this sources your problem
Thank you for using Fixya.com

Jul 20, 2008 | AEG Santo U 86000i Compact Refrigerator

1 Answer

Want to know how to install a d frost o matic model 8145


1) Copy following links for defrost timer resources, explanation, manual, general description and illustrations:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
http://waterheatertimer.org/images/8145-20-wiring-600.jpg

2) Generally:
Power wires connect to terminals 1 and N.

Heater turns ON during defrost cycle, so heater connects to NO terminal 3, and to terminal N

Refrigeration fan motor is OFF during defrost cycle, and ON during refrigeration cycle, so it connects to terminal 4, and to terminal N.

Limit switch, which is the pressure or temperature sensor, connects to to terminal X and to terminal N. When defrost cycle pressure or temperature reaches set point, the limit switch activates, and this causes 8145 timer to reset, and then defrost cycle ends.

Jan 30, 2013 | Hardware & Accessories

1 Answer

FRIDGE IS NOT AUTOMATICALLY DEFROSTING, PLEASE ADVISE WHY


When asking for help, you should include the brand and model number to help get a great answer.

The automatic defrost system has 3 parts. 1: Timer. 2: heater. 3: thermal switch

The timer will start the automatic defrost cycle every so many hours. If the timer fails, the defrost cycle will never start. The electrical schematics should be under or on the back of the refrigerator. You can use this to figure out how to test the timer.

The heater is what does the actual defrosting. If it is broken, it will not heat.

The thermal switch turns the heater off when enough ice has been melted. If this switch fails, it will prevent the heater from heating.

The heater and the thermal switch will be wired in series and their connections will be securely covered so you cannot test them independently. You can electrically test then together but you cannot decide which one is broken unless you expose or cut a wire. I have never seen a heater fail.

I see timers and thermal switches fail. Heaters don't fail very often.

The heater and thermal switch are in the freezer area and are very close to the evaporator. You will have to take apart enough of the freezer compartment to get to these parts. You will also need to melt enough ice to get to these parts.

Jan 14, 2011 | Whirlpool 21.0 cu. ft. Top Freezer...

1 Answer

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
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

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

1 Answer

On a Paragon 8145-20 Defrost Timer, I know you land the refrigeration circuit on terminal 4, the heater on terminal 3, but what goes on terminal "X" and terminal "N"


Link below has 8145-20 wiring diagram:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

Terminal N is 2nd wire needed to complete circuit.
In 240V 8145-20, there are two hot wires.
One Hot connects to terminal 1, with jumper to terminal 2.
Second Hot connects to terminal N, and this will power the clock motor and timer.
Terminal X is for temperature or pressure termination switch.

Defrost cycle works like this:
Timer is running but switched OFF.
Refrigeration fan is ON.
Timer switches ON, defrost cycle begins.
Refrigeration fan turns OFF.
Hot gas defrost turns ON.
When temperature-or-pressure limit switch reaches trip point, it switches timer OFF.
Refrigeration fan turns ON again.
Hot gas defrost turns OFF.

Aug 01, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

Amana AFB2534 freezer is regularly getting frost buildup at the back. first 2 times it was so bad that it blocked the vent & prevented cold air from reaching the refrigerator. Freezer just doesn't seem...


This is either of three defrost parts. The timer, heater or defrost limit switch. Most amana's I fix have a bad limit switch which is clipped to the freezer coils directly. Spin your defrost timer till it clicks and check the same frost laden wall to see if the frost starts to steam and melt. If not, unplug the fridge, then try disconnecting the limit switch and join those 2 wires together. Replug and see if the heater starts steaming. If it doesn't it is most likely the timer. The heater is usually the last thing to die, unless your heaters are encased in glass. In which case a quick visual inspection for decay and separation will pinpoint the problem.

Mar 05, 2010 | Amana AFB2534DE Bottom Freezer French Door...

1 Answer

ICE is not melting, I hv change timer & biometls. Pls advise ?


There are three things in the defrost system.

The heater, The Timer and The Defrost Limiter

If you have changed the heater and the timer the only thing left is the limiter providing you are getting power to the system. the limiter is cliped onto the evaperator at the top. this is located behind the back wall of the freezer.

Jan 11, 2010 | Whirlpool 25.6 cu. ft. Side-by-Side...

2 Answers

Our Whirlpool SVF15NRHW01 does not defrost it just ices up


Your refrigerator has a defrost timer and this could be the problem. It appears to be inside the refrigerator. Locate and try to turn the timer slowly clockwise until it clicks and compressor stops. The refrigerator should remain off for 20 to 30 minutes and the freezer heating element should come on. The sound of crackling in freezer indicates ice cracking and beginning to melt. Let me know what happens, Thanks, Sea breeze.

Mar 25, 2009 | Whirlpool 25.6 cu. ft. Side-by-Side...

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