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.

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.

Official sources

• Coleman-Mach 9420-330 Multi-Zone Wall Thermostat Installation, Operation & Application Guide

Related fault codes

• Coleman-Mach Solid Green — Thermostat
• Coleman-Mach Off — Thermostat
• Coleman-Mach Solid Red — Thermostat
• Coleman-Mach Fast Flashing Green (4 Times/Sec) — Thermostat
• Coleman-Mach Slow Flashing Green (1 Time/Sec) — Thermostat
• Coleman-Mach Alternating Red & Orange — Thermostat
• Coleman-Mach Alternating Green & Orange — Thermostat