AC Issue

What Johnny T says is true. I find that if I run my fans on HI they won't ice up.
It only happens when hi humidity and low inside temp. There is not enough heat going across the coils which causes them to freeze up.

I suspect it is the hard start capacitor. Start your AC an listen for the compressor to kick in about 10-12 sec after the fan starts blowing if you dont hear the compressor, then it could be your hard start capacitor. Reset all your AC breakers see if that frees up the compressor. Also make sure your thermostat is set for AUTO an not just fan hi/low. Then again at 90+ degrees should defrost on its own without too much hassle.

There is a possibility that your unit has iced up.. The only way to know for sure is to remove the air intake inside and look up or get on top and remove the shroud... If it is iced up then the ice will have to be removed before the unit will adequately cool...

If iced up then there are two issues... Why did it ice up? and How to clear the ice to allow for adequate airflow... First clearing the ice..What I have done when I have encountered this is use a heat gun and spend an hour removing the ice build up.

If the unit is a heat pump then there is an ice sensor and a reversing valve that is engaged when the heat pump is generating heat that will work to melt the ice... My experience is that the technology does not always take care of business if one is in high humidity and high temperatures for an extended period of time. One note the larger the space the heat pump has to service the more likely it will be challenged.

We have twoheat pumps... The living area unit has iced up twice in ten years. The bedroom one has never succumbed to high humidity high temperatures by icing up.

JohnnyT