08-20-2021, 07:15 AM
One of my 4 was also VERY noisy the last time we went out. It was making all kinds of racket when it was running. I also have Duo-Therm's with heatpumps.
After taking it apart, I found that one of the squirrel cage fans (the house side) had come loose and was causing most of the racket. Tightening up the set screw helped with that end. The evaporator end was only a little loose, but tightening it up also helped with some of the noise. There's a cut-out in the fan that allows for accessing the set screw, though for final tightening I stuffed my hand into the fan and used a short allen wrench to ensure it was tight.
None of the other 3 had gotten loose when checked and cleaned.
But, even ducted they are noisy units.
After taking it apart, I found that one of the squirrel cage fans (the house side) had come loose and was causing most of the racket. Tightening up the set screw helped with that end. The evaporator end was only a little loose, but tightening it up also helped with some of the noise. There's a cut-out in the fan that allows for accessing the set screw, though for final tightening I stuffed my hand into the fan and used a short allen wrench to ensure it was tight.
None of the other 3 had gotten loose when checked and cleaned.
But, even ducted they are noisy units.
06 M450LXi 3 slide