Duo-Therm furnace: Thermostat does not shut off heat - Fiberglass RV


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Old 11-22-2013, 12:58 PM   #1
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Name: Mr.Joe
Trailer: Tow Low
California
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Duo-Therm furnace: Thermostat does not shut off heat

1970's Duo-Therm trailer furnace. Worked well until a very cold wet trip, around midnight the temperature was close to 90F in the cabin, furnace thermostat appears to have failed in the on position.

This is a Duo-Therm 11HRU LPG unit without external thermostat.

Question 1: Where is the thermostat hidden?
Question 2: Where is a replacement available from?
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Duo-therm1.jpg   duo-therm2.jpg  

duo-therm3.jpg   duo-therm4.jpg  

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Old 11-22-2013, 02:19 PM   #2
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Name: David
Trailer: 1978 Trillium 1300
Cumberland, Indiana
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That little black knob below the red knob is basically your thermostat. It is integral with your main valve. There is probably a probe looking device that is the temperature sensor.


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It is that metal thing kind of coiled up in this this picture.

You may need a new valve. Probably worth having it checked out by a pro.

Here's a chart showing replacement valves for your heater.

http://www.ntpdistribution.com/PDF/V...kchart1of2.pdf



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Old 11-22-2013, 03:03 PM   #3
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I located the probe. Are these replaceable or is valve assembly replacement the only viable option?
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Old 11-22-2013, 03:14 PM   #4
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Name: Dave W
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I am not familiar with your furnace, but I think that what you show in your picture would be the thermocouple for the pilot light. Not the temperature sensor.
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Old 11-22-2013, 04:01 PM   #5
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I found the sensor (just like your photo), it is on the back of the control valve
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