My 2014 Flagstaff 27RLWS travel trailer was outfitted from the factory with an analog Coleman-Mach thermostat. We found that it did not control the temperature swings above and below the set-point to our satisfaction. The RV warmed up too much before the AC kicked in and in the cooler weather, the temps This means that a thermostat upgrade was in my future.See writeup here.

Awesome writeup and thanks for sharing. I've got the same stat in my 2014 FR Windjammer and will be looking to do this mod in the future.

Ron3rd wrote:Awesome writeup and thanks for sharing. I've got the same stat in my 2014 FR Windjammer and will be looking to do this mod in the future.You're welcome. There were a few glitches in the narrative since I created to initial post, but these have now been corrected. Just in case anyone was wondering what I was going to do about the 3rd screw - that wall will be covered with Smart Tile so the hole will disappear. ;)

I did the same mod a few years ago. I was afraid someone (me) might bump into the switch so I used a slide switch on the side.

I do love that slide switch. Maybe one of these days I will change the switch to one like that. Looks much better. Low priority though, since it is just the wife and I and the only thing that is in front of the thermostat is the dish drainer.How do you find the thermostat's function?

Works really nice. Holds the set temp much better than the original. Since we keep it on the cool side at night it's nice to have it kick on and warm things up before we get up.

5-2 Day Programmable Honeywell Thermostat Upgrade

wmoses
Explorer
Jul 29, 2014
Playtime II wrote:
On the Honeywell mod, remove the faceplate and then jump the 12v(+)terminal to the AC (or Heat)terminal Thus bypassing the thermostat's thermometer until the interior gets within the operating temp of the thermostat.

A 3" piece of 18ga works fine.

You can always buy a RV themostat and avoid all of this.

And this clears the "EE" message in the display? I searched for a more elegant way to reset the thermostat but so far could not find any info.

I'd rather do the reset than buy an RV thermostat at this time.
Playtime_II
Explorer
Jul 30, 2014
You do not need to reset/clear the Honeywell. It just displays EE (since it does not recognize the extreme temperature, it does not know to heat or to cool so it won't send 12v to the system needed (AC/Heat)). Once the interior reaches a temp within the spec, it will display the temp.
wmoses
Explorer
Jul 31, 2014
Okay now I understand your previous post. Thanks.
AH64ID
Explorer
Jul 31, 2014
I put a non-programable Honeywell in my camper and it's been a great mod. I put the low/hi switch in the camper wall just above the thermostat. It won't get bumped, and I don't plan to pull the thermostat when I sell the camper.
dieseltruckdriv
Explorer II
Jul 31, 2014
I put a Honeywell 5-2 in our 5er as well. It is the same one we have at home, so I didn't need to learn a new thermostat.
I love the fact that our camper will warm up in the morning before we get out of bed.

I just wired the AC to run at high speed all the time, because if I want AC, I want AC!

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5-2 Day Programmable Honeywell Thermostat Upgrade

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