Solution for Needing Replacement Lower Vent Assembly for Advent Air AC Unit

Updated 03/17/2025 | Published 03/14/2025

Question:

I have an ACM150 with the wall-mount thermostat. It replaced a much older air conditioner on a Travel Supreme 5th wheel. The unit was bought and installed in June of 2022 fro eTrailer.com and worked for two years. It no longer functions. An RV service tech says the upper unit works fine. I show 13.19 volts DC and 122 volts AC at the digital relay. Is there any way to test the digital relay output? I have an ohmmeter and a degree in Computer Systems Engineering, so I am not a novice around electricity. Any help would be appreciated.

asked by: Duke P

Expert Reply:

Hey Duke, if the upper unit is good I would just go ahead and replace the lower unit with the part # ACDB. That said I don't have a way to test the current relays. Does yours have a ducted or non-ducted setup?

expert reply by: Jameson C