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Old 09-03-2019, 12:22 AM   #41
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16ACE27's Avatar
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 6,206
THOR #7035
Originally Posted by Drsasser View Post
I saw the op had replaced the original thermostat because of the very reason we want to do the same, So I ordered a Honeywell digital from amazon model number RTH5100B, Everything went well except the a/c would not come on, Fan worked, heater worked but no A/C, Setting down trying to make sure I had it all wired correctly and the A/C kicked on and started running.

So I located the manual and started reading, Seems the thermostat waits 5 minutes to make sure not to damage the A/C compressor called Quote

"built in compressor protection" This feature helps prevent damage to the a/c or heat pump system. Damage can occur if the compressor is restarted too soon after shutdown This feature forces the compressor to wait a few minutes before restarting.

During the wait time the display flashes the message "cool on" When the safe wait time has elapsed the message stops flashing and the A/C starts working. End Quote.

My problem is it waits several minutes when I first turn it on!
This feature I do not like but in reading the book I can't see any way to disable it.
I may have wasted $50.
Mine does that but only when:

1 - I have turned the AC off then turned it right back on, or
2 - When I have removed 12 VDC for whatever reason and restored 12 VDC.

Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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Old 09-04-2019, 07:28 PM   #42
Senior Member
Brand: Thor Motor Coach
Model: Windsport 29m
State: North Carolina
Posts: 328
THOR #9553
Coleman didital

Originally Posted by Choxnpinz View Post
Greetings! I've searched the forums and seen so many different threads I'm now thoroughly confused.

2018 Thor Chateau 31W with a Coleman Mach 15k BTU air conditioning unit on the roof. No heat strip (although I'd love to get one). Propane furnace.

The thermostat (as pictured) is losing its touch with reality, and I'd like to replace it with a digital one, but I have no electrical background. The slider can sit in one position and the A/C will stay on forever or sometimes not start up at all. If I shut it off for and walk away to cuss to myself under my breath for a few minutes, it usually comes back to its senses, but will turn on when the slider hits the trigger temp and then never shut off when the desired temperature is reached.

Some threads mentioned a Honeywell unit (but every thread recommends a different model) and one recommended an Orbit unit (which I noticed only has an ON/AUTO for fan and no way to adjust it for HI or LOW flow).

Has anyone replaced theirs with a digital unit and had everything go RIGHT? Most threads involve jumpers, swapping wires, and lots of head scratching that would just leave me feeling frustrated and angry with myself for not knowing more about how the system works.

I'll answer any questions you may have if you need more info, but I'm hoping for one unequivocal correct "guaranteed to work every time" model that an idiot can match wire for wire and not screw it up. Yes, THIS idiot. LOL

Many thanks!!

I got the digital Coleman thermostat and had Camping World install it. Think labor was $20 bucks or something. Works great!!

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Old 09-10-2019, 12:27 AM   #43
Junior Member
Brand: Thor Motor Coach
Model: Vegas 25.6
State: Louisiana
Posts: 13
THOR #14398
Broken testator or ac

Good evening. I’ve been a “lurking member” since feb, when we purchased our “new” 2018 Thor Vegas 25.6 I have learned a lot from the forum posts. We were in El Paso last Friday when the roof air quit. It doesn’t come on or make any noise. I don’t know if it is air or OEM thermostat. I pulled tstat off wall to check wiring. Found yellow connected to red wire in wall, but the red wire was connected to “Y” post on control box in plenum (so i think that is ok.). I’ve got 12volts to red wire and 120 volts to roof air. Is there some way to “jump/bypass” tstat to get roof air to engage?


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coleman, digital, mach, replace, thermostat

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