Can Coleman Mach-C Everest be Controlled with Firefly Multiplex System
Updated 09/24/2026 | Published 09/19/2026
Question:
Can it be operated/controlled by an existing Firefly multiplex panel which controls the existing Coleman Mach unit?
asked by: K_enn
Expert Reply:
Thanks for reaching out Ken. Unfortunately, your existing Firefly Multiplex system will not be able to control the Coleman-Mach Everest Variable Speed RV Air Conditioner System # CM35MR. Based on what you've described, it sounds like your current Coleman-Mach system uses the Coleman-Mach Firefly Control Box (model 9530-952), which was designed for the older R410A Coleman-Mach air conditioners.
The newer R32 systems, including the # CM35MR, have been redesigned with different electronic controls, wiring harnesses, and communication connections. Because of those changes, we have found that the new R32 air conditioners are not compatible with existing multiplex control systems. I'd have to assume there is progress being made on this front, however we have not been made aware of anything.
Are you looking to replace a single AC system or do you have a multi zone system currently?
Product Page this Question was Asked From
Mach-C Everest Variable Speed RV Air Conditioner System - 18K Btu - Ducted/Non-Ducted - R32 - White
- RV Air Conditioners
- Complete AC System
- Cool Only
- 18000 Btu
- Standard Height
- Single Zone
- Rooftop
- Ducted
- Non-Ducted
- White
- Coleman-Mach
more information >
Continue Researching
- Q&A: Does Coleman-Mach Mach-C Everest Have Inverter-Driven Compressor Like Furrion Chill Cube
- Q&A: Can Coleman Mach Everest Replace Mach 15 and Use Same Wiring
- Q&A: Will Mach-C Everest System Operate Existing Furnace
- Q&A: Will the Coleman-Mach Everest 18K BTU AC Work with the In-Command System on My Keystone?
- Q&A: Will Coleman-Mach Everest Use the Same Connections As Coleman-Mach 48000 Series
- Q&A: Replacement RV AC Unit Recommendation for Coleman Mach 15
- Q&A: Parts Needed to Swap Coleman-Mach Mach-C Everest With Advent AC135
- Article: RV AC Not Cooling? What's Normal, What to Check, and When to Replace
- Article: Practice Safe Trailer Towing with These 4 Tips
- Article: What are the Common Types of Propane Fittings Used on RVs?
- Article: Do You Really Need Brake Upgrades for Towing? Here's How to Tell
- Article: Trailer Wiring Diagrams
- Article: What RV AC Will Work With Your Setup? Avoid Costly Mistakes Before You Order
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
Don
9/23/2026
I was told by air excel it won’t then work with any other thermostat and or any existing stat wires , they claimed you have to use their proprietary thermostat wires . However that is just not true. I wat he’d videos of dealers cutting the ends and using existing stat wiring . I didn’t same and it works perfectly. One thing was confusing is I have furnace power and ground up to roof air . To make the heat thermostat work from my old dometic to the new Coleman you simply don’t use the positive feed from thermostat and wire the one brown ( I think) wire from the new unit to the negative from furnace. Works like clockwork .