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Old 05-16-2016, 10:04 AM   #1
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Furnace thermostat not cycling

Hi! I'm new here and have a question about the furnace in my 2012 Coachmen 30 BHS travel trailer. My furnace lights - although it take several tries. I have to turn it on and off for it to light, but eventually it does. So I guess maybe that part is not really a problem.

However, once it gets going, it will turn off when it gets to the temperature on the thermostat, and it comes back on again a few times when it dips below that temperature. But eventually it just shuts off and doesn't come on again. If I move the temperature control up, it will come on again, but not on its own.

The thermostat has a controller for activating the A/C or the heat on one side, and a fan control switch on the other side - it says, "auto", or "lo" or hi" (which is manual).

Any ideas? Is it likely the thermostat/controller? Or am I just doing something wrong?
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Old 05-16-2016, 06:29 PM   #2
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It's broken.


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Old 05-16-2016, 06:52 PM   #3
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If you have the standard analog Suburban thermostat, it's a piece of junk. I had the same problem with my Roo 19. I replaced it with a Honeywell digital - problem solved.

Had the same one in my Mini Lite. First mod I did was replace it with the Honeywell digital. ($25 at Home Depot).

If you've got an analog Coleman Mach, there's a digital replacement:

Coleman 8330-3362 Heat & Cool Thermostat - Thermostats - Air Conditioner Parts - Air Conditioners - RV Appliances
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Old 05-16-2016, 07:06 PM   #4
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Rockfordroo: Thanks! Are you suggesting I replace it with the Honeywell, or the digital Coleman?
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Old 05-16-2016, 07:25 PM   #5
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Also, yes, I have an analog Coleman Mach.
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Old 05-16-2016, 07:26 PM   #6
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Can I just use any standard/regular digital thermostat from Home Depot? It looks like that Coleman digital is some type of special "RV" thermostat...
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Old 05-16-2016, 07:58 PM   #7
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If you have the analog Coleman Mach, the digital replacement is the easiest, as the wiring is like-for-like. The digital version goes for ~$55.

The Honeywell (I used a RTH 111) is cheaper, but if you want to keep the 2 speed fan, you need to install a SPST switch in addition to the Honeywell.

If you aren't electrically inclined, I'd go with the digital Coleman Mach replacement. If you are and want to save a few bucks, I'm attaching some pics and wiring diagram.

I installed my SPST in the t-stat itself as you can see in the pics. If you get an RV-type rocker switch (part # in the PDF diagram) you can mount it right in the wall next to the t-stat.
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Attached Files
File Type: pdf Thermostsat wiring.pdf (121.6 KB, 27 views)
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2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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