Good Video. Bad news. Atwood will probably not be responsible for this problem as it is a bad install by the OEM. Yes, the design and run off of the slide cover has caused your water intrusion. The removable door needs to be installed better with a better gasket. DO NOT use silicone to seal the removable door. Your real problem is the vertical mount. It is OK to install vertical, but you must take special care tom prevent water intrusion. Your interior where all the water is, is causing the circuit board to not function. If you dried out the area and the circuit board the furnace would probably run correctly. The furnace will NOT run if you leave the chrome exhaust pipe OFF. You can just insert it into the exhaust metal pipe to run the furnace once it is dried. Without the metal exhaust pipe installed the intake impellor will just draw exhaust gas back into the chamber and snuff out the flame. If it was my unit or my customers unit, I would make and install a drip cap on top the furnace mount to make sure the water could not flow down the side of the furnace from the slide cover. Doug
