Dometic AC and Heat Pump units Blow but don't Cool

[mdmarmd]

I have a 2017 Montana Montana 3720RL and tried to use the AC this last trip. Have hardly used it in the past as RV camp usually is not overly hot.

I have Dometic Units: Blizzard NXTTM Model
Air Conditioner with LCD SZ Controls Thermostat 3313192.019 C/F-Blk
(Living Room and Kitchen)

Heat Pump with LCD SZ Controls Thermostat 3313193.017 C/F/HP-Blk
Bedroom/Bathroom)

Using the Capacitive Touch Thermostats, both the AC and Heat Pump blowers go on but only seems to blow room temp air. Neither do any cooling when set on "automatic" and when set on high, they possibly blow slightly cool air but never cool the RV down.

I don't have a way too pull the RV myself as it is just towed to indoor storage 15 miles from my RV site in the fall and back in the spring. So paying for the round trip tow would cost $400 to $500 I think.

The only way to service it would be to hire a mobile repair service that is about two hours away and would charge for the trip plus hourly rate.

Is there any trouble shooting I might do before I call out the repairman?

Thanks.