Firefly Control for Coleman Equipment Troubleshooting Guide

Coleman‑Mach rooftop air conditioners equipped with the Firefly multiplex system. This assembly manages communication between the rooftop unit and the Firefly network, ensuring proper cooling operation, mode control, and system responsiveness.

Built to Coleman‑Mach specifications, this control box restores reliable performance when experiencing communication faults, intermittent cooling, or non‑responsive Firefly wall controllers. Ideal for RV technicians and service centers needing a direct‑fit, plug‑and‑play replacement.

Features:

• OEM Coleman‑Mach Firefly‑compatible control box

• Ensures proper A/C communication and cooling operation

• Direct replacement for failed or unresponsive control modules

• Supports multiplex Firefly network integration

• Designed for select Coleman‑Mach rooftop A/C systems

Wiring Expectations
* Firefly network uses a 4-wire CAN/MUX harness for communication and power.
* The 9530-952 control box requires a clean 12V DC power supply.
* Furnace call wiring is routed through the control box and triggered by Firefly commands.
* Ensure rooftop unit harnesses are fully seated and free of corrosion or damage.

Technician Quick Reference Page
Top 10 Checks:
1. Verify Firefly panel has 12V power
2. Check CAN/MUX harness connections
3. Confirm 12V at 9530-952 control box
4. Inspect rooftop unit harness
5. Test fan motor output voltage
6. Check freeze sensor continuity
7. Verify furnace call output voltage
8. Inspect high-pressure switch
9. Confirm Firefly commands are reaching control box
10. Replace 9530-952 if all else fails and communication is lost

Step by Step Guide

Firefly Network Modules (Firefly‑branded, not Coleman)

Sensors Used in Firefly‑Controlled Coleman Systems

Furnace‑Side Components Firefly Interacts With

Firefly‑Compatible:

• 9530‑952

• 9530‑951

• 9530‑955

• 9530‑957

• FIR‑MNET‑01

• FIR‑HVAC‑Z1/Z2/Z3

• FIR‑FRN‑12V

• VegaTouch / G6 / G12 panels

Sensors:

• 0150‑111 (freeze)

• 6535‑3441 (temp)

• 6535‑3442 (return air)

Non‑Firefly (for comparison):

• 9330‑333

• 9430‑336

• 6536‑344