HVAC Code Lookup

Coleman Furnace Continuous Amber Flash

WarningShown as: Amber LED flashing on and off continuously with no pauses

The flame sense current has fallen below 1.5 microamps. The furnace is still lighting, but the control can barely see the flame and will eventually lock out if the signal keeps dropping.

Manual wording: “CONTINUOUS AMBER FLASH: Flame sense current is below 1.5 microamps. Check and clean flame sensor. Check for proper gas flow.”

Documented for: TG8S, TGLS, TG9S, TM8T, TM9T, TM8V, TM9V

Likely causes, most common first

  1. Dirty or corroded flame sensor rod
  2. Poor gas flow to the burners

What you can safely check yourself

  • Replace a dirty air filter
  • Make sure the vent and combustion air pipes outside are clear of snow, ice, leaves or nests

When to call a technician

Cleaning the flame sensor means working inside the burner compartment with the gas on. Have a technician clean the sensor and measure the flame current. Ignoring it usually ends in a no-heat lockout.

A Coleman furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Other Coleman codes