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Old 11-10-2017, 09:16 PM   #1
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NORCOLD 1210 quits with "OP L1" code

My 18 month old Norcold 1210 stopped running about a week ago with an "OP L1" code, which means high temp limit switch has tripped. If you search the logs on RV.NET and HEARTLANDOWNERS you find out that this is a common problem caused by heavy rain or washing the trailer. Wonderful. Let's just hope it never rains on my trailer! There is a procedure to reset the switch using a magnet. I reset the switch using this procedure. So far so good. I had contacted both NORCOLD and THETFORD support and they both said I must go to an authorized service center. Try fixing it yourself first!
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Old 11-11-2017, 09:27 AM   #2
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Its good you found a fix
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Old 11-12-2017, 01:55 AM   #3
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Pressure washing seems to be the worst. In the spring I probably see 3-4 of these a week come through the shop. I keep a step magnet in my pocket for this problem. It affects all 12xx series Norcold fridges including old stuff with the recall kit. 1200s lose power totally when tripped.
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Old 11-12-2017, 08:50 AM   #4
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Any fix?

Is there a "fix" for this to avoid it happening? The reset with magnet is easy but it would be nice to avoid this from happening.
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Old 11-12-2017, 11:25 AM   #5
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Quote:
Originally Posted by dennisewitte View Post
Is there a "fix" for this to avoid it happening? The reset with magnet is easy but it would be nice to avoid this from happening.
The best fix is not getting water inside the un-protected refrigerator compartment. Rain has yet to cause this on a rig coming through my shop. What actually happens when water is blown into the top vent is the insulation around the flue becomes wet. When the fridge is then turned on the water is heated to a point causing steam. The steam tricks the pyrometer into thinking the burner can is over 600 degrees (twice what it should be) and shuts the fridge down. Norcold did this incase of a rupture of the cooling unit at the heat source. If it cracks in a heat cycle it is possible to ignite the then leaking hydrogen gas and cause a vigorous fire that has caused more than one total loss of the vehicle.

Although not safe or recommended you can bypass the protection ability of this device taking the responsibility into your own hands. If you were to unplug and jumper together the red and blue wire at the thermal protection box it would be out of the loop and not be able to shut the fridge down in the event of water or catastrophic failure.

Bypassing this safety is never recommended due to the potential of fire. You can Google "norcold 1200 fire" if you want to see why they started installing these. It is even a retrofit to older models. I have done several hundred of these on earlier models for a few recall campaigns.
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Old 11-12-2017, 01:48 PM   #6
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I am pretty sure my "OP L1" was caused by a 1.5" rainfall with winds at 20 mph gusting to 30 mph and with ambient temperatures in the 60s. The refrigerator was running on electric.

You are absolutely correct about the importance of this high temp switch and that it should not be bypassed.
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Old 11-12-2017, 06:23 PM   #7
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Quote:
Originally Posted by dennisewitte View Post
I am pretty sure my "OP L1" was caused by a 1.5" rainfall with winds at 20 mph gusting to 30 mph and with ambient temperatures in the 60s. The refrigerator was running on electric.

You are absolutely correct about the importance of this high temp switch and that it should not be bypassed.
Ok, I totally understand the wind driven rain like that doing it. We don't usually see that in our season in northern California. Usually someone is careless washing.

We don't get crazy amounts of rain.
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Old 11-24-2017, 12:24 PM   #8
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Still working

Two weeks later the refrigerator is still running fine with no more "OP L1" codes!
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