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Old 01-20-2010, 07:49 PM   #1
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Question Norcold 1200 LRIM Defrost Cycle

The refrigerator enters a cycle that allows the frost to melt off of the fins in the refrigerator section. This cycle appears to last an excessively long time allowing the freezer and refrigerator temperatures to rise excessively before restarting normal cooling. I understand that the cycle start is set on a fixed timer (49 hours?). What causes the cycle to end and normal cooling to resume?

Al
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Old 01-20-2010, 08:06 PM   #2
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Everything is controlled by the control board. The fin sensor should sense the change and start operation of cooling when required.
Check your 12v battery & ground post connection at base of refridge for good connections.
The sensor would be the cheapest to change first than control board if necessary.
The refridge will require a few hours to bring down temps in box, freezer should still be frozen.
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Old 01-20-2010, 08:11 PM   #3
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I seem to remember that the cooling starts when the fins reach 41 degrees.
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Old 01-21-2010, 03:39 AM   #4
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Al, please give use the serial number too. What year is your refrigerator?
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Old 02-01-2010, 06:16 PM   #5
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I seem to remember that the cooling starts when the fins reach 41 degrees.
I can't imagine the fins reaching 41 degrees. By that time the food would be very warm. I have been doing some extensive monitoring of fin temp and compartment temperature. At 36 degree fin temp the food compartment is up to 39+ degrees and the freezer compartment is approaching 15 degrees.

Based on my observations the fins are completly clear when the fin temp reads 32-33 degrees. It takes an additional 2.5 hours to get the fin temp up to 36 degrees.

I have been collecting data including freezer compartment temp, box temp, fin temp, indoor and outdoor temp to see if I can pin down a pattern.

I have replaced the thermistor and the cooling unit has no problem getting the food compartment down to 32-35 degrees with the temp set at 5.

I have no idea what happens during the defrost cycle other than cutting off the electric elements or gas valve. If anyone know what happens during this cycle other than the heat being removed I would be interested in learning that.

I have been simply shutting off refrigerator power from the control panel; leaving it off for 10 seconds and turing it back on. Doing this every couple of days the refrigerator performs well. If I don't do this it will take 6+ hours before it will restart cooling cycle. By this time the freezer compartment is melting and the ice cream is like soup.

Lacking any other information I am beginning to think that there may be a problem with the control board. It seems to cool about the same at temperature settings between 5 and 8. I just dropped the temp setting to 4 after the fins defrosted this afternoon to see if there is a change in box or fin temperature.

On the topic of the control board, does anyone have any experience with Dinosaur Electronics boards?

Al
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Old 02-01-2010, 06:20 PM   #6
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Al, please give use the serial number too. What year is your refrigerator?
The refrigerator serial number is 1441295. I don't have the cooling unit serial number handy and it's raining outside!

I have checked the cooling unit and it is not covered by any of the current recalls.

The coach is a 2005 so I assume that the refrigerator is also that vintage. I did not see a date of manufacture on the inside label.


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Old 02-02-2010, 04:04 AM   #7
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I will look up the info when I get to work today and get back to you.
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Old 02-02-2010, 04:33 AM   #8
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I will look up the info when I get to work today and get back to you.
Mike, Thanks.....Al
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Old 02-02-2010, 07:25 AM   #9
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If your freezer compartment is defrosting than it looks like you may need a new board only the fins should defrost. The temp in box should recover faster than six hours.

RV Upgrade's carries the board you need, have never had to change a board but people will swear by them.
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Old 02-02-2010, 08:41 AM   #10
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Originally Posted by 007";596125]If your freezer compartment is defrosting than it looks like you may need a new board only the fins should defrost. The temp in box should recover faster than six hours.

[B][URL="http://www.rvupgradestore.com/index.asp?PageAction=VIEWCATS&Category=424
RV Upgrade's[/URL][/B] carries the board you need, have never had to change a board but people will swear by them.
The freezer compartments are not defrosting, just getting too warm to keep ice cream firm. Meat stays frozen OK. Freezer compartment gets up to the upper teens / lower twenty's if I let it run it's course without a power off / power on which is enough to make the ince cream soupy.

Thanks for the pointer to a possible board supplier. I have found two others that I know nothing about. I have to check the part number on my board but these look right.

Dinosaur Electronics 6212XX Norcold 2-Way & 3-Way Replacement Board Camper Trailer RV

RV Direct Online Store

Regards, Al
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Old 02-02-2010, 04:06 PM   #11
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Al, please give use the serial number too. What year is your refrigerator?
The Cooling unit serial number is CU1931025

If it matters the control board part number is 0449 621271
I posted the main serial number of the refrigerator previously.

Al
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Old 02-02-2010, 07:05 PM   #12
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Al, from what I can find out, it looks like the control board is not operating as per design; allowing the longer time needed to reduce the ice on the fins of the fresh food section. Looks like you need a new control board if the thermistor you replaced is in fact good.
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Old 02-02-2010, 07:43 PM   #13
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I bought a brand new spare control board from eBay late last year for only $65 including shipping.

If you are sure you need the 621271 board, there is several on eBay, but there is one right now for $195 and free shipping.

Good Luck!

Dr4Film ----- Richard.
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Old 02-02-2010, 09:07 PM   #14
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To check your thermistor and see if its good go to page 17 of this pdf to test it. There are other trouble spec's that you may want to check also.
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