My panasonic cs-2470kr split air con is lea...

Find the drain on the outside of the house (should be located near the condesing unit outside) it is pvc and as I said it should be near the outside unit. This pvc will be sticking out of the house to which you can take a wet/dry vac and hold it to the end of this pvc pipe and it should remove the algae that is clogging up your drain pan. This is the easiest way to unclog an a/c unit. Going to the inside of the furnance can be done using a wet/dry vac to remove the debris in the drain pan however, the clog could possibly be in the a/c condensate drain trap that is why I suggest going to the drain on the outside of the house and removing the clogg that direction.

Good luck on repairs.

Dave