We have two seven year old goodman systems and one is operating fine. The second gas pack will not fire on a rainy day! All other times it operates well - hot or cold. When its raining the induced draft fan kicks on and the unit goes through its 3 firing cycles before it shuts down completely. We can confirm gas firing each of the three firings, but after less than a minute - maybe 10-30 seconds - the gas shuts down. We can reset the unit and maybe it comes on in 12-15 attempts. Of course it is always working when service shows up. HELP!
