Hotpoint AH12E07D Owner's Manual And Installation Instructions page 13

Before you call for service...
Normal Operating Sounds
picked up and thrown against the condenser on rainy
days or when the humidity is high. This design feature
helps remove moisture and improve efficiency.
compressor cycles on and off.
49-5000684 Rev. 1
or on rainy days. The water may overflow and drip
from the outdoor side of the unit.