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sub zero 501f freezing up


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22 replies to this topic

#1 rat454

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Posted 14 November 2010 - 08:45 AM

My sub O 501f ser# M1073712 is collecting alot of ice in the drain trough. It overflows into my ice maker and ultimately killed it.  Before I go and replace a bunch of parts I wanted to understand how and what to check to get to the root cause.  Can anyone help with a service manual that would instruct me how to diagnose each component so I can determine if it needs replacing.

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#2 rat454

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Posted 14 November 2010 - 03:27 PM

Does the evaporator cover come off easily.  I can't readily see how it comes off.  To replace the defrost heaters this has to come off correct?

#3 RegUS_PatOff

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Posted 14 November 2010 - 03:40 PM

http://img14.imageshack.us/img14/8760/pagefromsubzero500serie.jpg
.

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#4 rat454

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Posted 14 November 2010 - 03:53 PM

Thanks for the diagram.  Can you give any tips on how to verify the defrost timer is working properly.   

#5 RegUS_PatOff

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Posted 14 November 2010 - 03:56 PM

one test, manualy turn it slowly while measuring the voltage at the Defrost Heater ..
.

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#6 DrFrige

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Posted 15 November 2010 - 06:46 AM

WOAH WOAH WAIT!!! If you look at the drain trough, does it look like a frozen waterfall? If so, it is NOT your defrost drain heater. You need to install a 4-20-148-0 Heater package. it comes with two heaters... USE BOTH! some techs will only install the auxilliary heater and not replace the drain trough heater... REPLACE IT! even if the original ohms out good. I will peel the old one off and use a heat gun to warm up the drain trough. then stick the new one on.

Also, take a turkey baster and flush that drain out as well when all is defrosted, make sure that is clear as well.


#7 RegUS_PatOff

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Posted 15 November 2010 - 06:54 AM

[user=9641]DrFrige[/user] wrote:

.. 4-20-148-0 Heater package. it comes with two heaters... USE BOTH! ..

http://www.repaircli...?R=154&N=819008

 

00965889.jpg


.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#8 DrFrige

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Posted 15 November 2010 - 07:03 AM

[user=3641]RegUS_PatOff[/user] wrote:

[user=9641]DrFrige[/user] wrote:

.. 4-20-148-0 Heater package. it comes with two heaters... USE BOTH! ..

http://www.repaircli...?R=154&N=819008

 

00965889.jpg

 


You friggin rock Reg! :D

That is the package!



#9 rat454

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Posted 15 November 2010 - 07:20 AM

The whole drain trough is solid ice all the across and I'd say it kinda looks like a waterfall.  So its the trough heater that's my problem?  There is a stainless wire that goes into the drain tube.  Could that be bad too?  Is this part of the heater kit, i don't see it in the picture?

#10 DrFrige

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Posted 15 November 2010 - 07:36 AM

[user=72560]rat454[/user] wrote:

The whole drain trough is solid ice all the across and I'd say it kinda looks like a waterfall.  So its the trough heater that's my problem?  There is a stainless wire that goes into the drain tube.  Could that be bad too?  Is this part of the heater kit, i don't see it in the picture?


It is not part of the kit, However it is one of those situations where, the cost of the part is minimal vs, the time to de-ice and get to it. If it were MY refrigerator, I would replace it just for peace of mind. And I would ohm it out as well, if the old one is good, I would now have a backup spare should the other one go out. I keep them on the truck so when I have it apart, I can ohm it out and if the customer needs it, I have it.

But in your situation where you want to do this once and forget about it, change it.

Allow yourself a good two hours to do this. TAKE YOUR TIME!!! do not scrape or break out the ice, use a hair dryer or heat gun (If you just opt to turn the freezer off to de ice it, make sure that drain pan does not overflow and water all over your floor.)

remove the icemaker, then the 4 screws holding up that crisper glass shelf. After you remove the ice from the drain trough, is there frost on the back wall? If so, you are going to have to remove the back panel. to do this, DISCONNECT ELECTRICAL POWER TO THE FREEZER EITHER BY UNPLUGGING IT OR TURNING OFF THE CIRCUIT BREAKER! (That was from my old technical manual writing days) remove the light shield on top, you will see a grille for your evaporator fan blade, there are two stainless screws you remove. Now remove the grille and the back panel should come forward. disconnect the pwer and ground wires from your cold control and you will now be able to free that panel from the unit. Once again, use a hair dryer to de ice it.

Take your time in assembling the new heater in place... CAREFULLY tuck the wires behind the channel (you will see what I mean as you progress) make sure none of them are pinched when you tighten it all back together.

Sounds scary but it isn't, just read the directions that come with the heater very carefully and you can do it.

 

Good luck!!!


#11 rat454

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Posted 15 November 2010 - 08:00 AM

Thanks for the feedback.  Can you give me the part# of the drain tube heater?

#12 rat454

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Posted 15 November 2010 - 08:04 AM

Searches gave me 3013550 but looks like not available.

#13 DrFrige

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Posted 15 November 2010 - 08:31 AM

[user=72560]rat454[/user] wrote:

Searches gave me 3013550 but looks like not available.

it is but Sub Zero went through a part department debacle. There is a new part number but I do not know what that part is. I would check RepairClinic.com or call Sub Zero at 1-800-222-7820 and ask for the parts dept and they can get you the right part #

#14 RegUS_PatOff

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Posted 15 November 2010 - 08:48 AM

3013550

substitute

7014688

http://www.repaircli...R=154&N=1568012

 

01098229.jpg


.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#15 rat454

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Posted 15 November 2010 - 04:31 PM

should the defrost terminator be clipped to the center top of the evap?  I took the evap cover off and it was just hanging not clipped to anything.  It looked right by the length of the wires that it should be clipped there.   i unhooked and checked the resistance and it read open.  should it be open when at room temp?  Also part of the defrost heater coil was not pressed into the evap coil.  is this normal?  this would probably be causing poor transfer of heat to deice the coils right?

#16 rat454

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Posted 15 November 2010 - 04:39 PM

what is the defrost terminator's purpose.  when i look at diagrams online for a 501f  it is not in the same place as mine.  its on the left top facing the freezer.  I found an ice maker for $55 at filter outlet.com  part # RIM900.  says its a replacement for 4200520.  What do you think.  much better price than 130 everywhere else ive seen.

#17 RegUS_PatOff

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Posted 15 November 2010 - 05:02 PM

Defrost Terminator should be clipped onto the Evaporator ..

Defrost Terminator should be open at room tempearture.. that's it's purpose,

to stop the Defrost when it gets warm.

 

.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#18 rat454

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Posted 15 November 2010 - 05:09 PM

I turned the defrost timer to make the defrost cycle start.  The drain tube wire were hot and the wires got hot but the evap heater was not hot.  The evap heater showed no voltage.  I bypassed the terminator and got hot.  Is my terminator bad?  I could check it by putting a heat source (hair dryer)  to right?

#19 rat454

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Posted 15 November 2010 - 05:14 PM

Should'nt the terminator be closed until it gets warm after the defrost cycle nears its end then open and stop current and heat flow?

#20 rat454

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Posted 15 November 2010 - 05:28 PM

The terminator latches the current flow to the evap heater correct.  When the evap is cold the terminator is closed and allows current flow.  The defrost timer turns the compressor off when in defrost cycle and the evap eventually raises in temp from the evap heater and in turn heats the terminator causing it to reach temp then go open.  By then the defrost timer times out and the cooling cycle turns back on and the terminator waits for another defrost cycle correct?  i believe my terminator is bad.  i checked ohms with a hair dryer on it and it kept reading open.




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