mikerodg Report post Posted June 5, 2016 I have an 03 Phaeton Diesel pusher. It has 2 ac/heat pump systems on the roof. The AC works great on both. When I tested the heat pumps it was 47 degrees outside. The heat pump on the rear works. But the heat pump on the front turns on and then immediately turns off. Any ideas on where to start with this? Thanks, Mike Share this post Link to post Share on other sites
kaypsmith Report post Posted June 5, 2016 The reversing valve may be failing. Share this post Link to post Share on other sites
mikerodg Report post Posted June 7, 2016 Thanks JohnJohn from Tittin network suggested turning it to AC first then to heat. His tip worked. I'm thinking maybe it as stuck in a cycle and just had to be re-cycled through the options. Anyway it was 55 degrees out, generator running since I no longer had shore power, turned it to air for a few seconds, turned it off, then turned it to heat and it turned on and ran longer than before. Mike Share this post Link to post Share on other sites
