Red light blinking 4 times on furnace
- Goodman furnace red light blinking 4 times
- York furnace red light blinking 4 times
- Luxaire furnace red light blinking 4 times
- Nordyne furnace red light blinking 4 times
- Trane furnace red light blinking 4 times
- Carrier furnace red light blinking 4 times
- Tappan furnace red light blinking 4 times
- Flashing red light traffic signal