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Coleman-Mach RV Air Conditioners
Models, part numbers, thermostats, power draw and where to get parts.
Coleman-Mach is Airxcel's RV air conditioner brand, based in Wichita, Kansas, and one of the two most common rooftop AC brands in North American RVs. Here's how to tell which unit you have and what fits it.
QUICK ANSWER
Coleman-Mach's current rooftop lineup includes the Mach 15, Mach 3 Plus, Mach 10 and Mach 8 Plus in 13,500 and 15,000 BTU, plus Quiet (NDQ) and heat pump versions. The first digits of the part number show the profile: 38/48 is medium, 35/45 low and 37/47 ultra-low. Coleman-Mach 9 Series thermostats and control boxes don't work with older 8 Series parts.
WHICH COLEMAN-MACH DO YOU HAVE?
Coleman-Mach model guide
Model
BTU
Profile
Part numbers (2025 catalog)
Mach 15
15,000
Medium
38204-065, -066, -068, -069
Mach 3 Plus
13,500
Medium
38203-065, -066, -068, -069
Mach 10
13,500 / 15,000
Low (just over 11 in)
35203-0762/-0792; 35204-0752/-0762/-0782
Mach 8 Plus
13,500 / 15,000
Ultra-low
37203-076/-079; 37204-076/-079
Mach 8 Cub Plus
9,200
Ultra-low
37201-076
Quiet (NDQ): Mach 15, Mach 3, Mach 10
15,000 / 13,500
Medium / low
38204-0663, 38203-0663, 35203-0793 and others
Heat pumps: Mach 15 HP2, Mach 10 HP, Mach 8 Plus HP
15,000
Medium / low / ultra-low
38004-066, 35004-0762, 37004-076 and others
Everest VS-18
Variable speed
Low
One model for ducted or non-ducted; soft start built in
From the 2025 Coleman-Mach catalog and coleman-mach.com, checked October 2026. Airxcel also announced VS-14 heat pump models in August 2026.
READING THE LABEL
How to read a Coleman-Mach part number
The prefix shows the profile
38xxx / 48xxx: medium profile
35xxx / 45xxx: low profile
37xxx / 47xxx: ultra-low profile
Retailers still list older 4xxxx numbers (such as 47203-079 for a Mach 8 Plus 13.5K) next to the newer 3xxxx numbers, so match the full number and the specs
The suffix shows the setup
DQ means ducted and NDQ non-ducted (Quiet Series)
Ducted units need a ducted ceiling assembly and return-air grille; non-ducted units use a ceiling assembly that blows straight down
15,000 BTU heat pump models start with 38004, 35004 or 37004
THERMOSTATS AND CODES
Coleman-Mach thermostats and what they show
Coleman-Mach's current controls are the 9 Series: the 9330A3341 digital zone thermostat, control boxes 9430A751 (cool only), 9430A755 (heat ready) and 9630A751 (heat pump), Bluetooth wall thermostats 9430A3543 and 9630A3523, and a Wi-Fi thermostat 9420-391. Coleman-Mach says 9 Series parts aren't backward compatible with the older 8 Series; 8330D3351 replaces older 8 Series zone thermostats.
What you see
What it means
"Er" in the temperature display
Temperature out of range or a remote sensor failed
"GAS" flashing
The furnace is helping the heat pump; not a fault
Green LED on the control box flashing, then steady
Normal: it's found the thermostat
Green LED off
12V control power is too low; the system won't run below 9.75 VDC
Heat pump locked out for 2 hours
Room fell 5°F or more below setpoint 3 times in a row, so it switched to gas
From the Airxcel 9330-33 zone thermostat guide. Coleman-Mach doesn't publish an E-code list for its 9430 and Bluetooth thermostats, so be wary of code lists online that claim to.
POWER
Amps, soft starts and generators
What they draw
Mach 15: 13.9 A cooling, 18 A in "desert" heat, 16 A with the optional heat strip
Mach 10: about 11.6–14.4 A cooling and 14.3–17.5 A in desert heat, depending on version
One rooftop AC is about the practical limit on 30 A service
Soft starts
Coleman-Mach's Soft Start Kit 1497-3601 fits all its rooftop ACs and heat pumps and cuts starting amps by up to 75%
Some Mach 10 NDQ units (35203-0993) come with a soft start from the factory
The Everest VS-18 has a variable-speed compressor and a built-in soft start
COMMON PROBLEMS
Common Coleman-Mach repairs
Usual suspects
Start and run capacitors, fan motors and control boards are the most-replaced parts
Clogged filters and closed vents cause frozen coils and weak cooling
Low campground voltage stresses the compressor; a voltage monitor or EMS helps
Mach 8 owner reports
Some owners have reported capacitor, compressor and refrigerant-leak failures on Mach 8 units
Airxcel said it found no systemic problem but identified "areas where improvements could be made"
If your unit is under warranty, call Coleman-Mach before buying parts
WHERE TO BUY
Where to buy Coleman-Mach units and parts
Store
Type
Coleman-Mach
Good for
Category specialist
Authorized Coleman-Mach retailer: complete units and parts
Matching parts to your model; free shipping on new rooftop ACs
Store details checked October 2026. Coleman-Mach support: (574) 247-9235, rvpsupport@airxcel.com; warranty claims and status (316) 832-3404. Manuals: library.coleman-mach.com · Contact Coleman-Mach
QUESTIONS
Coleman-Mach FAQ
Who makes Coleman-Mach air conditioners?
Coleman-Mach is a brand of Airxcel, whose RV Products division is based in Wichita, Kansas. Airxcel also owns Suburban, the RV furnace and water heater brand.
What's the difference between the Mach 15, Mach 10 and Mach 8?
Mostly height and capacity. The Mach 15 is a 15,000 BTU medium-profile unit, the Mach 10 is a low-profile unit just over 11 inches tall, and the Mach 8 Plus is ultra-low profile. The Mach 10 and Mach 8 Plus come in 13,500 and 15,000 BTU.
What does NDQ mean on a Coleman-Mach?
NDQ means non-ducted Quiet Series, and DQ means ducted. Non-ducted units blow straight down through a ceiling assembly; ducted units feed the RV's ceiling ducts.
Will a new Coleman-Mach thermostat work with my old system?
Not always. Coleman-Mach says its 9 Series thermostats and control boxes aren't backward compatible with 8 Series parts. Part 8330D3351 replaces older 8 Series zone thermostats.
How many amps does a Coleman-Mach 15 draw?
Coleman-Mach lists the Mach 15 at 13.9 amps cooling, 18 amps in hot "desert" conditions and 16 amps with the optional heat strip.
What is the Coleman-Mach support phone number?
Coleman-Mach (Airxcel) technical support and parts: (574) 247-9235, or email rvpsupport@airxcel.com.
NEED A COLEMAN-MACH PART?
Start with your part number
RV AC Guys is an authorized Coleman-Mach retailer and can help you match a unit, thermostat or part to the one on your roof.