If these items do not solve your problem call an hvac service professional to help.
Safety switch in the attic.
And if you remember that you have a float switch you can easily go into the attic and examine the ac systems drains.
Float switches are great and can save anyone the headache and expense of coming.
Luckily most hvac companies install a drain pan and float switch to help you avoid these sorts of problems.
If they are clogged you then can try unclogging them yourself or place a phone call to an ac professional to come unclog your system s drains.
Wherever that extension cord is connected to power you could extend that circuit from there to the poe and then connect the poe.
We see it happen in attics where someone was moving boxes in and out of an attic and bumped the unit or pan.
Even if the blower is in a utility closet or crawlspace the damage from a leak can be substantial.
It is perfectly safe to install a switch in the attic.
If your blower is in your attic the water can leak through your ceiling and cause serious damage.
This switch could be the problem.
There is a safety switch installed in the attic that you can engage that will cut the power to the lift in case you are going away for awhile or for whatever other reasons.
Do not bypass the safety switch or you could have a huge water mess in your home.
What i was commenting on was the extension cord in the attic.
Having disconnected a 3 wire wall switch to an attic mounted whole house fan is it safe to leave live wires capped in the switch box covered by flat plate.