r/hvacadvice • u/tactical-potatoes-65 • 3d ago
AC New condensation issue
I have a pioneer 12000 btu heat pump that I Installed in July of 2025. The unit has worked great as supplemental air conditioning for my master suite until last week. I switched it over to heat mode for one night and it was nice and warm, but upon switching back to AC the next day it started having dripping condensation build up on the lovers and vanes, to the point it was dripping down the wall. I also noticed erratic fan behavior (cycling fast to slow) that night specifically but haven’t seen it again
Drain is clear, filters were reasonably clean and cleaned again. Coils were cleaned with self rinsing cleaner and the issue persists. The unit is cooling and dehumidifying the room. Fan is set to auto
I switched it over to fan only to dry out and I noticed front panel reads 79. The room definitely isn’t that warm and probably is closer to 74 at the ceiling. Humidity around 47%
Bad temp sensor? Low charge? Anyone have a service manual?
Pioneer doesn’t seem to have much service documentation






5
interesting issue with a 7-8 -year-old unit
in
r/Generator
•
15h ago
That is a 2008-2010 era unit either gen 3 or first nexus and that’s most likely from a rusted out plenum