Whoosh.
I pressed the "Cancel/Drain" button. The machine hummed—a valiant, laborious sound—and then... glug, glug, whirrr. It sounded like a asthmatic coffee maker. The water swirled lazily but didn't drop a single inch. unclogging dishwasher drain
I peered into the trap. It was surprisingly clear. This was bad news. It meant the blockage was further up the line. I shined a flashlight into the drain pipe coming from the wall. Nothing. Whoosh