Can anyone provide me a LED diagnostic codes for a Coleman furnace model number G8C07512MUB12A. I have a customer who is having some issues with her furnace but everytime I go there which is 2 times so far furnace never seems to act up and the diagnostic chart is missing. She tells me it flashes 4 times when it decides to act up. But I still would love to find the codes. She has no manuel for this furnace either. It is blinking 4 times. Also when there is no call for heat there is no LED light on even with a call for heat. I believe the board is going bad on this thing.