I have a Lennox 80 UHG3 60A furnace/ air handler up in the attic. The air conditioner unit is outside. There is water standing in the bottom of the pan in the air handler unit. When I took off the front panels and cut on the air conditioning unit on... It looked as if water was coming out of all parts of the air handler unit. There is a larger pipe.. not the freon tube... that where it goes into the air handler that water coming out of and running through the whole air handler unit and falling to the bottom There is about 3 inches of standing water in the pan below the air handler.

Could someone please let me know what the problem is and possibble solution.
I already spent over a $1000 last year have the circuit board replaced from a lighting strike.

Thanks in advance