I have a Tappan FG6RA 060C-12A furnace the fan is not running right and the red light blinks once and it says that is the "limit switch" is the problem on the inside cover for one blink of the red light and get the fan to stay on i have pushed the reset button in for a minute up at the top of the furnace and turn the power switch off for a few minutes and it goes right back to the red light blinking once the filter is fine