Control board fault: gas furnace codes by brand

The main control board detected an internal error.

Brand	Code	Meaning	What you can do
Carrier	45	Control circuitry lockout	Call a pro
Carrier	45.1	Internal control fault	Call a pro
Carrier	45.2	Gas valve relay will not close	Call a pro
Carrier	45.3	Control memory (EEPROM) fault	Call a pro
Carrier	45.4	Microprocessor communication lost	Call a pro
Goodman	EEE	Internal control board fault	Call a pro
Goodman	EEJ	Inducer relay error	Call a pro
Goodman	IF	Internal control board fault	Call a pro
Goodman	steady red light	Normal operation or control board internal fault (depends on model)	Depends on your model