When unit is turned on or off the outer shell
“pops” or “clicks.”
Normal sound. Outer shell is contracting or expanding and will
stop after a few minutes.
When unit is turned on or off “boiling” or
“running water” is heard.
Normal sound. The cause is refrigerant flowing inside the system
and will stop after a few minutes.
Foreign objects inside the unit are interfering
with fans or other moving parts.
Make sure unit is on a level surface.
Tighten bolts holding compressor to chassis.
Set temperature is too low.
Adjust the set temperature.