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Old 05-02-2009, 05:21 PM   #1
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2006 28' Safari SE
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Colorado Springs , Colorado
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Duo-Therm Thermostat out of calibration?

During the 4CU Vintage Restoration Rally in Albuquerque last weekend we started experiencing problems with the Duo-Therm Comfort Control thermostat. We used the heat pump and the AC at least once without issue but on Sunday morning I decided to warm the trailer up with the furnace and it wouldn't start. The inside temp was about 48 F so you would think a set point of 65 would work, but nothing doing. I then tried the heat pump again. Nothing doing there either. So we had a chilly morning. To get to the point, I got the furnace to work the next morning by upping the set point to 73 F (the trailer was ~48 F again). Moving the set point 20 degrees up or down demonstrated all systems working and pointed to the thermostat being out of whack. I speculated that the 50 MPH winds blowing dust around may have clogged the sensor but I haven't been able to get the front of the the thermostat off to check. That thing won't budge and I have a bad track record and a trail of broken plastic clips behind me. So first, does anyone know the trick to getting the front off the Duo-Therm? It must pop off. Second, has anyone seen this problem before? If so am I on track with cleaning it up or is it toast?

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Old 05-02-2009, 10:00 PM   #2
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2007 25' International CCD
1964 19' Globetrotter
2012 Interstate Coach
vero beach , Florida
Join Date: Mar 2005
Posts: 184
Thumbs down Thermostat; Standard Operating Procedure

STEP 1: Last 2 new Airstreams ( 06 & 07) both required extreme adjustments of thermostat to get operational. I'm saying, back it all the way down, then all the way up, then smack it with the palm of your hand.Keep messing with it until you finally get ignition. Once you reach a comfortable temperature, turn it off. Dont bother trying to set
it expecting it to automatically come back on when the temperature drops a few degrees. That wont happen.

STEP 2: Repeat STEP 1, or replace it with a BETTER unit.
Dennis & Ellen

07, 25' Ocean Breeze
64, 19' Globetrotter

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Old 05-03-2009, 06:55 AM   #3
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The cover may be removed by inserting a small screwdriver under the tab on the bottom edge of the front cover and gently prying. There's nothing under there that you can clean. The temperature sensor is probably a thermistor, which doesn't get plugged up.
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