This furnance is 2 1/2 years old, the unit has now started to go out during deep cold snaps. The drainline from the fan shroud to the trap builds up with water. This stops the auto ignition from working. This never happened before, why now? Is this typical with other brands of furnances or did I have a piece of sh!@#$%^ installed? Is the water condensation from the heat box or is this water coming in by way of the quality propane I buy.