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MZD2766GEW Defrost Failure


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16 replies to this topic

#1 VikingMoon

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Posted 30 September 2013 - 11:25 AM

I have had the Sears service guy out here multiple times for this issue. He has replaced the ADC a couple of times, but cant seem to get the job done. Stopped the extened warranty. Why have it?

Any who.. Did the 3 cycle check...Nothin'. Went to unplug the Thermostat to check continuity while the unit was running & got bit between the heater & the cooling coil checking for heat. Measured 36VAC across the Heater element & thermostat wire pins on the feed side of the molex connector. Shorted element?

Thermostat continuity seems OK.

Serial is 21500421AV

 

Many Thanks O Noble One!



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#2 DurhamAppliance

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Posted 30 September 2013 - 12:16 PM

First of all, the three cycle test sucks... it should be the secondary method because it sucks. Even during training sessions whirlpool admits the "on-off dance" sucks. So forget it, don't think about it, erase it from your memory. Just unplug or cut the breaker off for at least 30 seconds, turn the cold control to off and then turn power back on. This should initiate defrost.

It does sound like you have a short but did you ohm test the heater?

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#3 PDuff

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Posted 30 September 2013 - 12:41 PM

Also check the part number for the ADC installed.  For your model and serial it should be 61005988.  Seems like every MZD I come across needs a new ADC.



#4 bigbuck

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Posted 30 September 2013 - 12:51 PM

Part number: AP4069923

Part number: AP4069923

 

I have a question on this heater and defrost thermostat is if you look at manual it says it has a resistor of 240k ohms across the defrost thermostat meaning its build into it the as the way i read it and is also on the diagram .Point being can you just cut the thermostat out and use lets say a WR50x50 thermostat if the defrost thermostat is bad?What about 240 k ohms what that about? Sorry should of ask this question in another forum.


Edited by Samurai Appliance Repair Man, 30 September 2013 - 06:50 PM.


#5 VikingMoon

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Posted 30 September 2013 - 01:06 PM

I have 4 ohms across the heating element using a digital multimeter.

Will a Shorted Element take out the ADC? I dont get where this 36VAC is coming from.

 

I should get 120V at the heater when I do the unplug/ defrost test, yes?

 

I'll check the Module #.

 

Thanks!



#6 bigbuck

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Posted 30 September 2013 - 01:45 PM

If you have freezer apart and unplug the three wire plug and should get about 24 ohms between the black wire and the white wire with black dots .



#7 DurhamAppliance

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Posted 30 September 2013 - 02:17 PM

If your heater is 4 ohms, it's time to replace it.

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#8 RegUS_PatOff

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Posted 30 September 2013 - 02:26 PM

,,, What about 240 k ohms what that about?

only placed there (as a "marker") to assist in measuring the Defrost Heater Circuit when the Defrost Terminator is "warm" (open)

when measuring from the ADC wires

 

... Measured 36VAC across the Heater element & thermostat wire pins on the feed side of the molex connector.

unless otherwise directed,

all voltage measurements should be made with the devices connected

Sounds like "ghost voltage" when the ADC circuit isn't Defrosting.

 


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#9 bigbuck

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Posted 30 September 2013 - 02:31 PM

Could you use a Wr50x50 to replace a bad defrost safety?What do you think?Or buy whole assembly .



#10 DurhamAppliance

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Posted 30 September 2013 - 02:42 PM

if the limit is bad, no need to replace heater... a limit with similar ratings will work fine.

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#11 bigbuck

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Posted 30 September 2013 - 02:54 PM

Thats what i been doing and did not know about the 240k ohms as being a marker.That Reg can find anything out.I think he was the first computer.Maybe he is.Thanks Durham for your input as i been installing a new termination thermostat with the new board for years as i don't trust some of those newer looking terminations.



#12 VikingMoon

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Posted 30 September 2013 - 02:58 PM

Can I test the ADC Module for a 120v output with the bad heater out of the circuit then?

 

Should I hear a relay kick in on the board?

 

Thanks Again!



#13 RegUS_PatOff

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Posted 30 September 2013 - 04:57 PM

Can I test the ADC Module for a 120v output with the bad heater out of the circuit then?
Should I hear a relay kick in on the board?

 are you sure the "bad" Heater is 4 OHMs ?
Defrost Heaters usually don't "short"

You should test the voltage with some type of load copnnected..

maybe a 25w lamp

There is a Relay on the ADC you may hear


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#14 VikingMoon

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Posted 30 September 2013 - 05:12 PM

I measured across the Black & Heavy white Wire & get 4 ohms with the molex disconnected. When I touch the heater element & the metal fins of the cooling coil with the molex plugged in, I get a light electrical shock. Not a 120 volt kick, but It's not comfortable.



#15 bigbuck

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Posted 30 September 2013 - 06:06 PM

Unplug molex plug and power to box and check all 3 wires on molex plug with ohmmeter from each terminal on heater to ground.You should not get any reading.



#16 Samurai Appliance Repair Man

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Posted 30 September 2013 - 06:57 PM

Danced with this one just last week.  Intermittent warming in the beer compartment due to incomplete defrost cycles.  Sears hacked on it before I did and it was obvious the ADC was replaced because it was re-installed improperly.  Also, the defrost heater calrod was badly warped and had burned out part of the liner and foam insulation in the freezer because it had warped so badly.  Those defrost thermostats are famous for going intermittent causing incomplete defrosts.  

 

I gutted the beast and replaced both the ADC board and the defrost heater assembly.  All's quiet on the home front.  

 

Since your ADC board was recently replaced, you should replace the defrost heater and thermostat assembly:  Part number: AP4069923

Part number: AP4069923



#17 VikingMoon

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Posted 30 September 2013 - 09:11 PM

Mutchly Appreciated O' Exulted One.

It's on Order at your command.

 

Many Thanks to All For my Continued Enlightenment!

 

 

P.S.... Is Maytag better now as Whirlpool????

(or should I just push the next one off the loading dock BEFORE they put it in the van?)






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