Troubleshooting guide
Coleman-Mach 9420-330 thermostat status LED pattern
Use this when a Coleman-Mach 9420-330 multi-zone thermostat status LED shows off, red, flashing green, or alternating red/orange or green/orange network states.
Use this atlas to identify likely meaning and prepare for service. Shut off power, LP gas, fuel, or water when a listed appliance condition involves flame, gas smell, exhaust, generator shutdown, high temperature, moving jacks/slides, refrigerant, 120 VAC, control boards, repeated ignition failure, or a persistent lockout. Call the appliance maker, RV dealer, or a qualified RV technician for repair.
Owner-safe checklist
- Record the LED activity only if it is visible without tools.
- Record thermostat model, zone, touchscreen state, and whether heating or cooling responds from normal controls.
- Stop the affected heating or cooling call from normal controls if the thermostat does not respond normally.
- Contact qualified RV HVAC service for persistent abnormal status LED patterns.
Code tables for these appliances
- Coleman-Mach RV thermostats 14 codes
Related fault codes
- Coleman-Mach thermostat: Solid Green
- Coleman-Mach thermostat code Off: The device having no power or having completely failed
- Coleman-Mach thermostat: Solid Red
- Coleman-Mach thermostat: Fast Flashing Green (4 Times/Sec)
- Coleman-Mach thermostat: Slow Flashing Green (1 Time/Sec)
- Coleman-Mach thermostat: Alternating Red & Orange
- Coleman-Mach thermostat: Alternating Green & Orange