I HAVE A GOODMAN FURNACE THAT IS BLINKING 5 TIMES ON THE LED..THE VENT FAN COMES ON AND THEN AFTER A FEW SECONDS THE BLOWER FAN STARTS AND THE LED BLINKS 5 TIMES OVER AND OVER...THE HIGH LIMIT CIRCUT IS CLOSED..TROUBLESHOOTING SAYS 5 BLINKS MEANS IT IS SENSING A FLAME AND THE CAUSE IS A STUCK GAS VALVE...I DONT THINK THAT THE GAS VALVE IS STUCK OPEN AS THERE IS NO FLAME OR GAS???I AM THINKING CHANGE THE CONTROL BOARD...ANY IDEAS.THANKS FOR ANY HELP