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TMunsch  
#1 Posted : Thursday, May 26, 2011 3:56:06 PM(UTC)
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TMunsch

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Okay, been searching the forums and can find answers, but not the exact answer.


Background:
Had a power surge/outage about 3 weeks ago.

Problem:
Freezer and frig went out. Replaced control module/motherboard, as it was physically smoked. Unit started up and everything worked fine. The damper motor did however make a clicking sound until the frig side started to cool, and then it quit, now Freezer is cold, frig is not. Evap coil is iced over.

What I have done to date:

As stated, replaced control module/mother board.

Checked defrost thermostat when cold, it has continuity, opens up at room temperature.

Checked defrost heater, it has continuity.

Found out through a search here that the small clear coated wire loop taped to the freezer t-stat probe is probably the evap thermistor. It has 6.5 ohms at 76 degrees, room temperature. This thermistor does not show up as a part number on the parts list on section 5.

Checked both t-stats manually, and they open and close and have continuity when switching all the way from off to extreme cold setting as the dial is turned.


As I said before, evap and condensor fans are working, and the unit was cooling along just fine, then yesterday I noticed the temp in the fridge rising, snow in the freezer compartment, all the usual suspects for typical problems I have seen on here. removed back cover and the evap coil is iced over. Damper door was not working...

Any ideas what could be wrong...

Thanks,
Tom
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denman  
#2 Posted : Friday, May 27, 2011 5:13:38 AM(UTC)
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denman

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Here are your parts
Replacement parts for FRIGIDAIRE FRS26LF7DS2 Frigidaire/refrigerator | AppliancePartsPros.com

Here is the wiring diagram
http://manuals.frigidaire.com/prodinfo_pdf/Anderson/240389616.pdf

Try forcing a defrost cycle.

You may have two problems in the unit. One being the defrost and the other being the damper control.

But they may also be the same problem as defrost problems will show up first in the fresh food side and later in the freezer.

Check the defrost thermostat as they can go intermittent especially if they are deformed/ bulged out.
THIS FORUM IS DEAD!!!!!!!
TMunsch  
#3 Posted : Friday, May 27, 2011 6:47:14 AM(UTC)
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TMunsch

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How do I force a defrost cycle?

In addition, I have all those diagrams, but they do not show the evap thermistor part number. Does this appear correct from the reading I posted?

T,
denman  
#4 Posted : Friday, May 27, 2011 9:41:04 AM(UTC)
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denman

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[COLOR="DarkRed"]the evap thermistor part number[/COLOR]
Do you mean the evaporator thermostat?
The evaporator thermostat is Item 21 in Section 6 of the parts.
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TMunsch  
#5 Posted : Friday, May 27, 2011 1:40:26 PM(UTC)
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TMunsch

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Originally Posted by: denman Go to Quoted Post
the evap thermistor part number
Do you mean the evaporator thermostat?
The evaporator thermostat is Item 21 in Section 6 of the parts.


No, it's the small clear coated wire loop taped to the freezer t-stat probe. It does not show up on the parts diagram.

Again, how do I force a defrost cycle?

T,
denman  
#6 Posted : Saturday, May 28, 2011 12:40:05 AM(UTC)
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denman

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Forcing a defrost procedure is in the wiring diagram sheet.
Center of the first page (NOTE).
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TMunsch  
#7 Posted : Saturday, May 28, 2011 4:44:10 AM(UTC)
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TMunsch

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Originally Posted by: denman Go to Quoted Post
Forcing a defrost procedure is in the wiring diagram sheet.
Center of the first page (NOTE).


Perfect, thanks......

Now, what are your thoughts about the small sensor taped to the freezer t-stat capillary tube..? Could that be a thermistor? If so, do you know where I can get a part number, I don't see one anywhere?
denman  
#8 Posted : Saturday, May 28, 2011 5:38:19 AM(UTC)
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denman

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Looking at the wiring diagram I do not see a thermistor so I do not know what this is.

There is an insulating sleeve that goes over the probe but this is usually just a clear plastic tube.
THIS FORUM IS DEAD!!!!!!!
TMunsch  
#9 Posted : Saturday, May 28, 2011 6:52:15 AM(UTC)
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TMunsch

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Originally Posted by: denman Go to Quoted Post
Looking at the wiring diagram I do not see a thermistor so I do not know what this is.

There is an insulating sleeve that goes over the probe but this is usually just a clear plastic tube.


I know, driving me nuts, it is a wire that is plugged in series with the damper motor. It has a clear plastic outer jacket, with what appears to be a tightly wound wire coil inside. It is about 6-8 inches long, and just makes a loop, in and out of the plug. It is taped with foil tape to the capillary tube that goes into the freezer from the freezer t-stat. I cannot find reference to it anywhere. It ohms at 6.5 ohms, at room temperature, which is right inline wth some of the other readings I see from the other brands......I am at a loss here as to what to replace....or even the exact operating sequence for the defrost cycle.

T,
Gene  
#10 Posted : Monday, May 30, 2011 4:29:38 PM(UTC)
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Gene

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Hi Tom,

There are no any thermistors in your refrigerator because the temperature controls by two regular temperature controls and the only electronic part is the defrost control. If you can post a pictures, it might help us to understand what is it.

Gene.
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