In article ,
"mc" wrote:

The condensate dripping from the inside unit goes half into the pan as it
should, but another half blows away with the air flow, hits the plenum walls
and drips down missing the pan making a mess on the bottom of the furnace.

It looks like too much air flow or too much condensate but nothing changed
recently.

Any ideas?

There should be a water trap on the drain line to prevent the plenum
suction from blowing water & air inside.

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