Coleman-Mach thermostat · 1 model line
Coleman-Mach thermostat: Fast Flashing Green (4 Times/Sec)
Coleman-Mach documentation lists “Fast Flashing Green (4 Times/Sec)” as “The device attempting to make its initial network connection”.
What this message means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Coleman-Mach 9420-330 multi-zone wall thermostat (status LED) | The Coleman-Mach 9420-330 guide lists a fast flashing green status LED at 4 times per second as the device attempting to make its initial network connection. | Coleman-Mach 9420-330 Multi-Zone Wall Thermostat Installation, Operation & Application Guide |
What you can safely check
- Record the LED activity only if it is visible without tools.
- Record thermostat model, zone, and whether normal touchscreen controls still respond.
- If the fast flashing LED state persists, stop the affected heating or cooling call from normal controls and contact qualified service.
Stop and call a technician for
- Thermostat removal, wiring, zone control box, network communication hardware, installation, and power diagnosis are trained technician work.
Use normal thermostat controls only. Do not take the thermostat off the wall or disturb thermostat/network hardware unless qualified.
Write this down before you call
- thermostat model
- zone number
- LED activity
- touchscreen state
Other codes on Coleman-Mach RV thermostats
Full table: Coleman-Mach RV thermostats
- Er Er displays when ambient temperature is outside the thermostat display range or when a re…
- HI HI displays when current temperature is above 99 F (37 C).
- LO LO displays when current temperature is below 33 F (0 C).
- ELEC flashing ELEC flashes when the heat pump is in lockout because electric heat could not satisfy the…
- DIFF flashing DIFF flashes on the LCD when 2nd stage heat is operating because the heat pump cannot sat…
- DIFF DIFF displays when backup heat is operating and the heat pump is locked out. / Coleman-Ma…
- FLASHING GAS HEAT Coleman-Mach's heat pump thermostat guide says FLASHING GAS HEAT can show during the two …
- Solid Green The device being connected to the network and communicating properly
- Off The device having no power or having completely failed
- Solid Red The device being offline and not connected to the network
- Slow Flashing Green (1 Time/Sec) The device having been online but having no valid network message for 5 seconds
- Alternating Red & Orange The device being offline and attempting to reconnect within 30 seconds
- Alternating Green & Orange The device being currently online but having gone offline 2 or more times