Just went through this with our zone 2 Heat Pump. Unit quit putting out AC and heat and AMP draw was low. Mobile Tech found a Freon leak in the condenser coil (in house coil). Can't speak for all units, but our Dometic unit Freon system is not designed for servicing AND there was a significant Freon leak in the coil. Now, before the pundits leap on me I KNOW anything is possible... Yes, I COULD cut into the Freon lines and add servicing points and I COULD have a new coil soldered in and then I COULD have the system evacuated and re-serviced with Freon... BUT, is it worth it...??
The fan motor and the circuit board are replaceable, but for me, anything within the Freon circuit is a "Replace the Unit"!
Ken & Anita
2011 Newmar Essex, 45'- 4522, Cummins 500 ISM, 2013 CRV, RVI2 Brake with TPMS