HVAC Code Lookup

Coleman Furnace 1 Red Flash

Safety faultShown as: One red flash, then a two-second pause, repeating

Flame was sensed when there was no call for heat. The control saw a burner flame while the gas valve should have been closed, so it runs the inducer and the blower to clear the heat exchanger.

Manual wording: “1 RED FLASH: This indicates that flame was sensed when there was not a call for heat. The control will turn on both the inducer motor and supply air blower. Check for a leaking or slow-closing gas valve.”

Documented for: TG8S, TGLS, TG9S, TM8X, TMLX, TM9X, TM8T, TM9T, TM8V, TM9V

Likely causes, most common first

  1. Leaking gas valve
  2. Slow-closing gas valve

What you can safely check yourself

  • If you smell gas, leave the house and call the gas utility from outside

When to call a technician

This means gas may be reaching the burners when it should not. Call a licensed technician right away - the gas valve has to be tested and replaced by a professional.

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

Sources

Other Coleman codes