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Old 05-28-2015, 01:23 PM   #11
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Quote:
Originally Posted by 12VOLTMAN View Post
Troutslayer is correct.
Now that I re-read the posting (correctly) I have to agree with Troutslayer. My bad.

The thermostat is wired incorrectly. The A/C unit is wired to the heater's contacts. And I expect the heater is wired to the A/C's contacts.

If this was my trailer, I'd have the cover off the thermostat and be figuring out which wires go to the furnace and A/C and which contacts close/open on temp rise. Then set everything up correctly. Test. Then try again on the rewiring. (It usually takes me a try or three to get it right).

But it sounds more like a dealer/warrantee repair.
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Old 05-28-2015, 01:28 PM   #12
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If it's a Furnace and A/C Thermostat I'll bet the A/C is wired to the Furnace side of the Thermo and visa-versa.
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Old 05-28-2015, 01:32 PM   #13
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Sounds like "W" and "Y" terminal connections are reversed, w being heating and y being cooling leg. At least that's the way it is on most residential stats.
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Old 05-28-2015, 02:57 PM   #14
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I know another thread mentioned replacing the factory mechanical thermostat with a residential fully electronic one. That will definitely change things!


Maybe even for the better.
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Old 05-28-2015, 03:19 PM   #15
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No heat works correctly
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Old 05-28-2015, 03:23 PM   #16
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I just changed out our Coleman/Mach mechanical with the digital replacement and it changed out wire-for-wire and works fine. I did notice that they don't seem to use the same color coding as they do in residential systems. I don't know that there are any hard and fast rules about color coding though.
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Old 05-28-2015, 03:29 PM   #17
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...snip... I don't know that there are any hard and fast rules about color coding though.
RV's definitely do NOT have any standards whatsoever!

The lighting may use the 4 wire (brown running lights, yellow left, green right (or is the other way around?)) Generally, white is ground or neutral or negative. Black or red will be 110/220 hot. Unless it's 12V positive. Green or green with a yellow trace should be 110/220 building ground.

Then they don't bother with special colors for the furnace, A/C or other system control wires.

Any repairs ignore color coding as well.
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Old 05-28-2015, 04:46 PM   #18
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………….RV's definitely do NOT have any standards whatsoever!
====Yep, that always adds another dimension to the trouble shooting!! Actualy saw a power utility once using "Green" for a phase conductor on a 3-phase system!
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Old 05-28-2015, 08:35 PM   #19
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This is normal operation. If you set the temp to 5 degrees above the ambient temp in the room (reading on the unit) what happens? If it comes on then you are fine.
I was wrong and thinking heat!!! AC temp setting down below temp in coach = on. Sorry for the mix up.

I would ask the dealer how it is supposed ot be wired and check yours first to save you a trip.
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Old 05-28-2015, 09:31 PM   #20
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So, heat works correctly (move temperature selector towards a higher temperature, furnace comes on, moving to a lower temperature goes off). BUT the A/C works the same way, moving the temperature selector to a higher temperature it comes ON, and lower it goes off.

My vote is defective thermostat. The A/C is pretty simple, either it's on or it's off. The Thermostat is going to determine if it's on or off. It has to be wired correctly if A/C is working at all with the AC/Heat selector in the AC position and the temperature selector at 90. If it was wired incorrectly the A/C would not work in with the selector in A/C mode.

So... (in my simplistic mind) the Thermostat is bad.

I would replace with a digital model (I went with Coleman Digital, but others use use a residential model with some minor mods).
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