Common fix for a Bosch Ascenta dishwasher, slow drain and E24 error code
Bosch Ascenta E24 drain pump
I have dealt with a fair number of Bosch dishwashers and have changed maybe one drain pump. Much more common problem is stuff clogging the feed to the drain pump, and/or stuff in the outgoing vent to the drain hose.
Unscrew the first filter, remove the metal plate, and then remove the mesh cylinder. Take a T15 and remove the small screw that holds the drain pump cover. Take a bunch of paper towels and a thin flat blade screwdriver and get all the popcorn seeds and other junk out of the way.
Now take a one foot long cable tie and run it up past the drain pump impeller into the tiny hole next to the impeller. This is the very small hole that faces the back of the unit. Keep moving the cable tie back and forth until you hear a "glug." You'll probably see a really disgusting lump of fat come out. Clean that up with a paper towel or a shop vac.
Put everything back together and prime with about a half-gallon of water. Hit "cancel-drain". You should hear the water gurgling as it flows out.
Source: Bosch Dishwasher Mod#SHE6AF02UC/03 E24 error code
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