Builder let water from roof run into HVAC unit causing it to freeze up. Is that freezing normal?
ya, i think you're worrying too much. the compressor is designed to take a pounding in weather, including freezing sleet
It's no different than if it had rained.
Nope, not normal, but then again. System are designed for the regions they are in. If you are in an area where the weather is not acting typical, within the norm. Then problems may result.
The moisture didn't come from the roof. It is called WEATHER, and the outside unit is EXPECTED to deal with WEATHER.
the unit should not have been set under the roof line regardless if you have gutters. there is always a possibility of ice coming off the roof and damaging the unit if your in a cold climate. rain water wont normally damage anything. I think your heatpump is not working normally and frosting up without defrosting normally. You might have a refrigerant leak.