i have a bosch SGE63E05UC dishwasher that has the E24 drain error code, which halts cleaning cycle.
I have looked for clogs under the screen and at the drain impeller...none appear and the impeller turns freely.
after fiddling about trying to get it to work, i have discovered that: * disconnecting the drain hose at the air gap under the sink and lying that hose down to drain it and even trying to suck out water from it (not too gross) and then blowing into it (check valve quickly engages so only a bubble or two out of the bottom of the dishwasher) and then reattaching it to the drain hose, the dishwasher will then work for the next cycle or two.
when working, it works! everything appears to function normally, including water being pumped out of the dishwasher into the disposal.
however, after a few days of not being used, the E24 will come back on and then i repeat the emptying of the drain hose as above*.
i dont understand what is wrong...?! it works, but then it doesnt.
before the E24 code appears, during the first minute i turn on the dishwasher cycle, i can hear the drain pump turn on and off maybe three times, i think the washer pump may go on briefly, and then the code appears and the dishwasher is stopped.