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Old 02-12-2020, 10:11 PM   #1
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Thermostat trouble

2018 Rockwood Mini Lite. We are having to turn on and off
Unit to keep it at a certain temperature. This is first time ever with an RV. Is this normal?
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Old 02-12-2020, 11:13 PM   #2
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Actually, we're brand new to travel trailers and we have a 2020 Forest River Flagstaff e-pro 14fk. We only had time this season for two short weekend trips and in both cases, the thermostat on our Suburban furnace did not do a very good job of regulating the temperature. I looked the thermostat over and it was a pretty crude electromechanical device and I found it to be pretty useless. When it got cold inside, we pushed the 'temperature' up and when it got too warm, we had to turn it back down. Isn't that the purpose of a thermostat, not us? I'd like to replace it with something that actually regulates the temperature. The a/c is totally separate, so all this thing needs to do is open a circuit when it's warm enough and close a circuit when it gets cold. Anyone have a suggestion for something better?
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Old 02-12-2020, 11:44 PM   #3
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I changed ours out for a Colman-Mach electronic thermostat and solved all of our heating and cooling issues
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Old 02-13-2020, 12:12 AM   #4
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Popular topic, there are tons of threads on this very issue. Give it a search and I'm sure you'll get the info you need.
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Old 02-13-2020, 12:29 AM   #5
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Analog versions of the colman thermostat have a large temp swing between off and on...like 4 or 5 degrees. The digital ones work much better like 1-2 degree on/off. Wire for wire swap to the digital if you have the colman.
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Old 02-13-2020, 12:42 AM   #6
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I had the same problem with my analog Coleman-Mach. It would turn on once, then never again unless you turned it off first.

The digital version of the Coleman-Mach runs around $55-75 depending on where you get it.

I replaced mine with a Honeywell RTH 111 (about $25 at Home Depot). Only real issue is that it doesn't support 2 fan speeds, so you need to install a SPDT switch if you want to keep two speeds. It's also battery powered vs RV powered. If I were to do it over again, I'd install an RV style ON/ON SPDT rocker switch on the wall next to the T-stat. I'm attaching in updated wiring diagram to the one in the link below that shows the PN for the rocker switch.

You can also go with the programmable version (RTH 211).

Or any other similar T-stat you find at Home Depot.

See Post #11 here:

https://www.forestriverforums.com/fo...t-85645-2.html
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File Type: pdf Thermostsat wiring with internal switches.pdf (194.6 KB, 9 views)
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Old 02-13-2020, 04:59 AM   #7
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Fan on Auto?
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Old 02-15-2020, 12:16 PM   #8
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I swapped mine for digital. It took maybe 10 minutes. Easy fix.
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Old 02-15-2020, 01:04 PM   #9
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Quote:
Originally Posted by john221us View Post
I swapped mine for digital. It took maybe 10 minutes. Easy fix.
Yep about 10 mins.
Old new
Home Depot, less than $20.
Wires are color coded easy peasy
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Old 02-15-2020, 02:19 PM   #10
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Another issue that often gets blamed on the thermostat is a) where the t-stat is mounted. If on an outside wall or in a cold corner, the t-stat will call for heat even though the rest of the RV is warm.
b) distribution of warm air from the furnace. If the furnace ducts are not evenly distributing air the occupant may be sitting in a warm spot but the thermostat is not.

Yes, a digital t-stat is more responsive, at least by design and I've changed out mine too. However the t-stat is mounted on a wall that has a cold draft in it so I'm planning on putting some insulation behind it as well as some "stand-off's" so more room air will circulate behind it.
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Old 02-15-2020, 11:45 PM   #11
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Quote:
Originally Posted by TitanMike View Post
Another issue that often gets blamed on the thermostat is a) where the t-stat is mounted. If on an outside wall or in a cold corner, the t-stat will call for heat even though the rest of the RV is warm.
b) distribution of warm air from the furnace. If the furnace ducts are not evenly distributing air the occupant may be sitting in a warm spot but the thermostat is not.

Yes, a digital t-stat is more responsive, at least by design and I've changed out mine too. However the t-stat is mounted on a wall that has a cold draft in it so I'm planning on putting some insulation behind it as well as some "stand-off's" so more room air will circulate behind it.
This has been suggested in a few other threads on this topic. After reading it in these forums, I did exactly that. Works in summer for A/C too...a lot of heat can get trapped in those thin walls, also causing reading to be off. A small amount of insulation in the hole they drill, or sometimes nor drill and just hack away, can all help to make your thermostat as accurate as possible.
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