Updated 2026-06-25

Furnace Error Codes by Brand

Pick your furnace brand to see its flash/fault code list, what each code means, and the safe checks to try first.

Carrier furnace codes11 codesGoodman furnace codes11 codesTrane furnace codes12 codesLennox furnace codes10 codesRheem furnace codes10 codesYork furnace codes12 codesHeil furnace codes11 codesFrigidaire furnace codes10 codesArmstrong Air furnace codes12 codes

How to read a furnace flash code →