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Old 01-11-2018, 06:23 PM   #1
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M.O.C. #19919
Dometic Thermostat showing inside temperature to be 32F

We have a 2 system comfort control center 2 thermostat in our 2017 3950BR. It has started to show unit 1 inside temperature to be 32 degrees F which keeps all systems in unit 1 running all the time except AC. Unit 2 is showing inside temp. to be 71 degrees F which is pretty close to accurate. Does anyone have an idea on how to get the inside temp to show actual instead of 32F ? Thanks.
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Old 01-11-2018, 08:26 PM   #2
AZ Traveler
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Check to make sure it is not reading C vice F. If you push the up and down arrows on the right side at the same time it will switch. If it is in fact reading 32F you may have a bad stat.
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Old 01-12-2018, 09:37 AM   #3
Mark Stueck
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32 degrees

I had this exact problem and it would return to normal at some point, maybe hours. One day it never came back, replaced thermostat NO CHANGE.
Inside the roof unit the cable from control board to thermostat (I had 2 connectors) is connected with standard phone connectors (RJ11). both Male and Female ends were badly corroded and no longer working. The moister in the roof unit just destroyed them. I expect this to be a recurring event so Iím getting the tool to fix them myself.
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Old 01-12-2018, 12:20 PM   #4
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Thanks for the reply. I also replaced the thermostat and so far have had no problems. Will try your approach if it happens again.
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Old 01-12-2018, 02:12 PM   #5
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Corrosion in the control box below the A/C unit is a problem, due to condensation. We had our front A/C unit fail several years ago, and upon inspection, I found corrosion all over the circuit board in the control box, in addition to the phone cable connectors. I replaced the box for a little over $100 at the time, and it has been working fine ever since. This is a photo of the corrosion on the circuit board.
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File Type: jpg corroded AC board.jpg (107.6 KB, 2 views)
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