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Sub Zero 642 Refrig warm

642 sub zero manual

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19 replies to this topic

#1 davetoolin

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Posted 04 November 2011 - 08:31 AM

Have a Sub Z 642/F Sn P1857170 built 10/2001 that we moved from one house to another and it was in storage for 6 months. just reinstalled it and the Refrig won't cool.

freezer works fine.
Re frig. stuck at 68 degs. Fan at top of refrig box seems to spin. cleaned the coils on the top.
Control panel doesn't have any error codes.

Looking for the technical manuals and or any hints as to where to start?

thanks in advance Dave

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Posted 04 November 2011 - 10:34 AM

Mod.# 642/f 42" built-in......we need to look at the evap panel....remove the shelf's light cover and a few screws ,,,, let it run for a hour or so...what does the frost pattern look like??? post a picture so all can see..........visit the section "service manual request" section ...........................keep us posted.

#3 davetoolin

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Posted 04 November 2011 - 11:01 AM

the Evap coil is room temp, not a hint of frost, Seems like the compressor is not on at all.

Dave

Sorry for the bad picture

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#4 RegUS_PatOff

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Posted 04 November 2011 - 12:24 PM

... Seems like the compressor is not on at all.

does the Fan inside the Fridge run ?
(when the Fridge Door Switch is closed)

SUBZERO 600-1 Addndm & PARTS
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#5 davetoolin

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Posted 04 November 2011 - 07:11 PM

Yes the fan runs, Got the Manual, Still trying to decode the service modes. Thought I had the Refrig compressor running for a few minutes. but can't seem to duplicate that.

Still reading thanks for the manual.

Dave

#6 RegUS_PatOff

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Posted 04 November 2011 - 07:27 PM

Yes the fan runs,

if the Fridge Fan runs,
then the Fridge Compressor should run,
unless the Compressor Start Relay is bad,
OR the Compressor Overload is bad.
OR the Compressor
.

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#7 davetoolin

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Posted 04 November 2011 - 08:49 PM

got it, tomorrow i trace power thru that path to the fridge compressor, very helpful.

ps what does the NTSC beer refer to?? fixed alot of TV's in my time and beer is good too.

Dave

#8 RegUS_PatOff

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Posted 04 November 2011 - 08:56 PM

  • Chief NTSC Black & White
all references to TV :)
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#9 davetoolin

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Posted 05 November 2011 - 01:48 PM

okay. I have power to the start relay. but then i pulled it off and measured no power between any two of the three pins from the relay?(brown thing) with 2 pin sockets and the white thing(overload protector).

Can anyone tell mie what i should expect there, the wiring diagram doesn't help mujch for how these three parts interact??

#10 davetoolin

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Posted 05 November 2011 - 01:55 PM

oops I lied, didn't wait long enough.
measured from the chassis there is 110v on the top pin of the compressor. and nothing on the two bottom pins.

guessiing I need a compressor.

Is it under warranty??

#11 RegUS_PatOff

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Posted 05 November 2011 - 04:47 PM

measure the resistance OHMs between the (3) Compressor pins...
should be anywhere between 5 to 15 OHMs ...
.

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#12 davetoolin

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Posted 06 November 2011 - 09:42 AM

Okay,
top pin to lower left 7.7 ohms
top pin to lower right 8.9 ohms
lower pins to each other 16.6 ohms.

Little suspicious that 7.7 plus 8.9 equal 16.6??

Dave

#13 RegUS_PatOff

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Posted 06 November 2011 - 10:00 AM

7.7 plus 8.9 equal 16.6??

YES

... measured from the chassis there is 110v on the top pin of the compressor. and nothing on the two bottom pins.

test again
.

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#14 davetoolin

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Posted 06 November 2011 - 11:52 AM

Got out the multi meter
readings

Grey wire - 121.9 VAC
Top Pin - 121.6 VAC
Brown wire and lower left pin 143.1VAC
Double white wire and lower right pin 0.VAC
Bottom White Wire - 0.0VAC

Also heard a relay click on and off a few times. Sometime the voltage on the top pin would disappear. but then it would click back and reappear and stay that way.

#15 jumptrout

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Posted 06 November 2011 - 02:21 PM

Replace the start relay it is bad.

#16 davetoolin

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Posted 07 November 2011 - 12:01 PM

I pulled out the PTC Start relay and measured it per section 6.3 of this document from Embraco and the resistance was 4.2 ohms So I think the relay is okay.
http://www.embraco.c.../g6fvojOMAG.pdf
One more piece of info. this morning the fridge was 62 deg inside. There may actually be some cooling going on albeit very small

Could it just need a refrigerant recharge??

#17 RegUS_PatOff

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Posted 07 November 2011 - 12:34 PM

... I pulled out the PTC Start relay and measured it per section 6.3 of this document.
.. There may actually be some cooling going on albeit very small
... Could it just need a refrigerant recharge??

1) could still be bad..
2) does the Fridge Compressor run ? OR click ... pause.... click ?
3) if it was low on Freon, and there's no frost, then the Compressor would be running "forever"
.

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#18 davetoolin

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Posted 07 November 2011 - 12:51 PM

The clicking only happen that one time.
Now after powering down the fridge and turning it back on I hear one click about after about 15 sec.

I took apart the brown thing we are calling the PTC start relay, but is sure didn't look like and relay I have seen.
no moving part inside. assume the click is from the overload dohickey??

Dave

#19 davetoolin

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Posted 18 December 2011 - 09:45 AM

To wrap up this thread, here is what end up happening. Finally convinced myself with the help from this forum that it what not an easy electrical problem I could fix. Called the local service place they came out and immediately diagnosed it as a defective evap coil.

The ordered the part( part covered the warranty and installed it 4 days later. working great.

The tech told me that during this time the used an aluminum coil that if left not running for a long period of time(ours was off for 6 months) they develop pin hole leak and even a recharge won't help.

Dave

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Posted 18 December 2011 - 12:04 PM

Your tech was correct on the leaking of the refrigerant from the evap.coil.....BUT, the pin hole was there way before the unit sat for the six months.....What you had was a "low side refrigerant leak"....The refrigerant will leak out when the is not operating, AND will not/barely leak out when the system is operating.... ( loss of molecules at a time ) ............... Low side of the system operating pressure is about 30 psi..... high side could be up to 90 psi........ I acquired an Amana refer from a customer that they had purchased , it had sat 3 months... low to no charge in the system.....Recharged the unit and it has been operating for 9 months...Had a set of gauges on it for the first 6 months and the low side psi had not dropped.........I keep it as a refer at the warehouse to keep the lunch and beverages :pint1: cold. Too expensive to replace the evap coil and sell, so it is a test bed for how long before the low side psi drops and freezer starts to warm...... What is interesting is the operation of the compressor ..As previously noted, a low charge will make the compressor operate / run longer... and the proverbially buzz / click that was previously mentioned... P.S. did the filter dryer get changed also???





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