Shortly after we got our ACE 30.1, I replaced the analog Mach thermostat with a digital one. The change out was simple as Jerry describes. Thor wire colors are intended more to no duplicate colors in their bundles and they have nothing to do with the thermostat wire color code.
This summer, I got tired of not being able to see the temperature without flashlight as we have the heat set to the low 50's at night and when I get up early in the morning I need to goose the temperature to heat the rest of the rig (we spend most of our camping at 7,000 feet plus and it gets cold overnight)
So after our last trip, I replaced the "replacement" with a Honeywell as described by Ray of Love Your RV --
http://www.loveyourrv.com/rv-thermos...-focuspro-5000
The mounting screws matched the location of the original Mach screws and I was able to route the wires through the exisiting cutout. Now I have a back lit thermostat. The Honeywell unit runs off of internal batteries instead of the furnace power - Something I discovered while chasing furnace water problems. I did have to install a rocker switch below the thermostat to control the hi-lo fan speed.
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