Originally Posted by rewillia
I have a new-to-me 2018 Classic M3 RQB with the dual front & rear Dometic HVAC units.
The trailer is currently connected to 50-Amp shore power, yet I can't seem to get the rear bedroom HVAC to turn/come on even though it shows the unit to be engaged (on) in the Multiplex Control Panel. I've have checked the breakers for both units (of which are in normal on position).
The front, center unit is operating normally, but again, the rear unit is not coming on.
Any ideas on how to troubleshoot this problem?
I assume you know that each AC is considered a "zone" correct?
When you press the zone button, it determines which AC is in focus for modification.
On my 2019, Zone 2 is the REAR AC and Zone 1 is the front AC.
Please verify you have pressed zone to switch between the 2 to turn them on or off.