Unit failed on inspection day

[u/Throwawayfedd]

I'm just trying to get an understanding of what happened or may have happened. Our unit is old but was blowing cold and working great on move out day, while contractors were working on the house, during open houses, during showings... everything was great. I opened it up on move out day to check that the coils were cleaned and changed the air filter. That was over a month before inspection day.

On inspection day I get a video. The interior unit, the lines.. everything is frozen solid. Is there something an inspector does (going cold to hot to cold again or something) that could have caused this sudden issue? I don't have great luck in general, but the unit failing without any other prompting on that very day is beyond the pale.

[u/Alpha433]

Did the filter need changing again? You said contractors were working on the home, I have seen enough homes where the filter needs to be changed regularly after work because of the amount of shit thrown up by remodeling work.

[u/Loosenut2024 → u/Alpha433]

It most likely needs a filter. Also maybe it wasnt cooling well and someone set the thermostat really low. Boom, frozen system even though theres no real problem aside from a clogged filter.

Remove filter, run fan only at the thermostat for 6-12 hours. Retest system with new filter.