2018 Classic air conditioner problem
The front air conditioner & heat pump would not come on. The fan only
would engage. Diagnosis: The AC power control board had a melted relay. Turns out this PC board is not a stock Dometic part. Because of the Firefly controls:
a special PC board is supplied by Dometic for Airstreams using the Firefly.
Airstream was out of stock on same and had to wait awhile to get the new part, requiring another stop at the Airstream dealer.
In addition, was told by my Airstream service that a service bulletin #173 was just issued for a recall of a possible damaged wire behind the fuse panel closest to the bedroom. They changed out that wire while working on the PC board. Might be something worth checking on.