The direct OEM replacement control junction box assembly for Coleman Mach RV air conditioner ceiling assemblies. This assembly restores proper communication between your AC unit's control components with factory-matched sensor wire leads and connectors already attached -- no splicing, no adapting, no guesswork.
When your Coleman Mach ceiling assembly loses reliable control input -- erratic thermostat response, sensor faults, or loss of fan and compressor signaling -- the control junction box is a common failure point. Heat cycles, vibration on the road, and moisture can degrade the connector block and sensor wiring over time. Swapping in the correct OEM assembly gets the system back to factory spec without modifying your existing wiring harness.
Part number 8330-5571 (vendor part CMN8330-5571) is sourced directly from Coleman Mach and is designed to fit the specific ceiling assembly housings that accept this junction box format. The sensor wire leads are pre-attached with matching connectors, so installation is straightforward for any DIY-capable RV owner comfortable working with low-voltage electrical components.
Genuine Coleman Mach 8330-5571 -- matches factory specs without modification.
Sensor wire leads with connectors included -- plug-in replacement, no splicing required.
Designed specifically for compatible Coleman Mach model ceiling assemblies.
Restores proper signaling between thermostat, sensor, fan, and compressor circuits.
The control junction box is the central wiring hub mounted inside the Coleman Mach ceiling assembly -- the interior portion of your rooftop AC unit. It consolidates connections for the room temperature sensor, control board inputs, and the low-voltage signal leads that communicate with your wall thermostat or digital control pad.
Common failure symptoms that point to this assembly include:
The 8330-5571 assembly includes the junction box and the pre-terminated sensor wire leads. Because Coleman Mach uses keyed connectors on their ceiling assembly wiring, this part connects directly to the existing harness inside the ceiling assembly without cutting or splicing. Correct polarity and connector orientation are maintained by the physical key -- no wiring diagrams needed for a standard swap.
This is a ceiling assembly repair -- the work takes place on the interior ceiling unit inside your RV, not on the rooftop condenser. General steps for a qualified DIY installer:
Coleman Mach produces several ceiling assembly configurations across their product line. The 8330-5571 junction box fits specific ceiling assembly models. Cross-reference your ceiling assembly part number or your AC unit's model and serial number against Coleman Mach's parts lookup before ordering. Using the wrong junction box assembly can result in connector mismatch or improper sensor calibration.
Coleman Mach rooftop air conditioners are among the most widely installed AC units on Class A, Class C, and fifth-wheel RVs. The ceiling assembly (the interior evaporator/air distribution unit) is a separate component from the rooftop condenser/compressor section. Control and sensor components for the ceiling assembly are specific to that half of the system and are not interchangeable with the rooftop module parts.
While the ceiling assembly is open for this repair, inspect the following: