Coleman Mach 9330-3121 -- Ceiling Assembly Selector/Control Knob
Restore full control of your RV air conditioner with this genuine Coleman Mach replacement knob. Designed as a direct OEM fit for 9330 and 9430 series ceiling assemblies, this knob eliminates slipping, cracking, or missing controls without any modification to your existing hardware.
Over time, the plastic selector knobs on Coleman Mach ceiling assemblies crack, strip their set interfaces, or simply break off -- leaving you with no way to switch fan speeds or operating modes at the ceiling control box. Coleman Mach part 9330-3121 is the factory-specified replacement knob for the ceiling assembly found on 9330 and 9430 series rooftop air conditioners.
This is a straightforward swap: remove the old knob, press or secure the new one onto the existing control shaft, and you're back to reliable, tactile operation of your AC ceiling controls. No wiring, no tools beyond what's needed to access the ceiling assembly, and no compatibility guesswork -- this is the part Coleman Mach designed for these units.
Factory-specified part number 9330-3121, built to the same standards as your original ceiling assembly hardware.
Direct replacement for ceiling assembly selector knobs on both the 9330 and 9430 Coleman Mach rooftop AC units.
Mounts directly onto the existing control shaft in the ceiling assembly -- no drilling, cutting, or adapter needed.
Restores mode and fan speed selection at the ceiling box. A fast, low-cost fix before replacing the entire ceiling assembly.
On 9330 and 9430 series Coleman Mach units, the ceiling assembly houses the manual selector knob used to choose operating modes (cool, fan only, heat if equipped) and fan speed settings. This knob interfaces directly with the rotary switch shaft inside the ceiling box. When the knob strips, cracks, or goes missing, the rotary switch beneath it is typically still functional -- making a knob replacement the correct first repair step rather than replacing the full ceiling assembly.
Before ordering a full Coleman Mach ceiling assembly replacement (which is significantly more involved), confirm the rotary switch shaft beneath the broken knob is intact and turns freely. If the shaft is undamaged, part 9330-3121 is all you need to restore normal operation.
This control knob is designed for use with the following Coleman Mach air conditioner series:
If you are unsure which ceiling assembly your unit uses, check the model number label on your rooftop unit or the existing ceiling assembly cover. The part number 9330-3121 should also appear in your Coleman Mach parts breakdown for the ceiling assembly section.
The 9330 and 9430 series can be operated via the manual ceiling assembly knob (this part) or via a wall thermostat, depending on your installation. This knob applies specifically to the ceiling assembly control -- the rotary selector mounted in the ceiling distribution box directly beneath the rooftop unit. It does not apply to wall-mounted thermostats or remote control systems.
When installing the new knob, inspect the rotary switch shaft for any play, roughness, or binding. A knob that failed due to stripped plastic may have been over-torqued during use. Set the shaft to your desired position before pressing the new knob on to avoid forcing the switch at an end stop.