Overheat: gas furnace codes by brand

A temperature limit inside the appliance was exceeded and it shut down to protect itself.

Brand	Code	Meaning	What you can do
Carrier	13	Limit circuit lockout (depends on model)	Safe checks first, then a pro
Carrier	26	Burner thermal switch open	Call a pro
Carrier	33	Limit circuit fault, a limit or rollout switch is open	Safe checks first, then a pro
Carrier	13.1	Limit circuit lockout, a limit or rollout switch stayed open	Safe checks first, then a pro
Carrier	26.1	Burner thermal switch open, permanent lockout	Call a pro
Carrier	26.2	Burner thermal switch open, permanent lockout	Call a pro
Carrier	33.1	Limit circuit switch open, blower running to cool the furnace	Safe checks first, then a pro
Carrier	33.2	High heat only for the current cycle	Safe checks first, then a pro
Goodman	E3	Overheat (depends on model)	Safe checks first, then a pro
Goodman	E11	Rollout switch open	Call a pro
Goodman	Ed	Manual-reset rollout switch open	Call a pro
Goodman	EE3	Primary limit switch open	Safe checks first, then a pro
Goodman	EEd	Auxiliary limit switch open (blower compartment)	Safe checks first, then a pro
Goodman	4 red flashes	Overheat (depends on model)	Safe checks first, then a pro
Goodman	5 red flashes	Sensor fault or overheat (depends on model)	Safe checks first, then a pro
Goodman	6 red flashes	Overheat / flue or venting fault (depends on model)	Depends on your model
Goodman	11 red flashes	Ignition failure or overheat (depends on model)	Call a pro