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Old 01-24-2005, 02:14 PM   #1
Ned
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Hi all,
I have a problem with one of the thermostats on my coach. It's a Duo-therm ducted AC with furnace and heatstrip functions. The thermostat looks like this:

The problem I'm having is: it functions only when the temp setting is between approximately 80 and 90, no matter what the inside temp is. It works, but the setting doesn't match truly what the inside temp is. This makes it difficult to set it to the temp you would want it to be.
Any ideas what might be wrong? I'm not certain, but think the actual thermostat is located in the unit in the ceiling...that's what I hear "click" when the temp setting is adjusted.
If anyone has encountered this problem before and/or knows a fix, please help.

thanks a bunch!!
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Old 01-24-2005, 02:14 PM   #2
Ned
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Join Date: Jan 2001
Posts: 86
Hi all,
I have a problem with one of the thermostats on my coach. It's a Duo-therm ducted AC with furnace and heatstrip functions. The thermostat looks like this:

The problem I'm having is: it functions only when the temp setting is between approximately 80 and 90, no matter what the inside temp is. It works, but the setting doesn't match truly what the inside temp is. This makes it difficult to set it to the temp you would want it to be.
Any ideas what might be wrong? I'm not certain, but think the actual thermostat is located in the unit in the ceiling...that's what I hear "click" when the temp setting is adjusted.
If anyone has encountered this problem before and/or knows a fix, please help.

thanks a bunch!!
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Old 01-24-2005, 07:21 PM   #3
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Recommend you replace T'stat; the click you hear up in the air cond is just the control board that is controled by the T'stat.
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Old 01-25-2005, 03:09 AM   #4
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RV Wizard - thanks. The wall mount thermostat looks to be a little easier to remove and replace than something up in the roof ac.
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Old 01-25-2005, 06:22 AM   #5
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I'm not familiar with that particular model of t-stat but sometimes it is possible to change the calibration by bending the lever a bit (under the cover).

Your problem is not unusual and I thnk most folks just push the lever up/down until they are comfortable and ignore the numbers along side. I had one that I marked with small arrows made from colored tape to remind us of our "normal" settings - one arrow for heat and one for cooling.
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Old 01-27-2005, 08:05 PM   #6
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RV Roamer,
The thermostat that Ned has does not have any lever as it isn't mechanical but rather is an electronic one that uses a thermisitor to measure the temperature. It also has a preamp and a few other itmes on that board. I suspect that it is repairbale, but that it would be less costly to replace it than to repair it. I have the same thermostat and the same air & furnace.
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Old 01-28-2005, 07:15 AM   #7
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Kirk is correct...it is electronic. After RV-Wizard advised the click in the roof unit was just a control board, I swapped the front thermostat with the suspected bad one in the bedroom. The problem went away and then I knew for sure I needed a new stat. I have one on order. Thanks to all.
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Old 01-28-2005, 02:09 PM   #8
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I figured Ned's t-stat would be the thermistor type cause the mercury ones don't do well in an RV, but I was thinking maybe the indicator lever could be bent a bit if it was long enough. But that was an outside chance at best. Oh well...
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