Thermador · Dishwasher error code

E23Drain pump blocked or faulty

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Related diagnostic guides

Guide · Dishwasher

Dishwasher water backs up into the sink or out of the air gap

When dishwasher water reaches the sink, the dishwasher pump is working and the restriction is downstream: a clogged sink drain or disposer outlet, a blocked air gap or a kinked hose. Sink water entering the dishwasher points to a missing air gap or high loop, or a failed check valve.

8 steps ~40 mineasy

Guide · Dishwasher

Gritty or sandy residue on dishes after washing

Grit is usually redeposited soil: a clogged filter, a drain that cannot clear (air gap, disposer, hose) or detergent that did not dissolve. Hard water causes white film rather than grit. Work from the filter outward, then check the drain path and the wash motor.

8 steps ~30 mineasy

Guide · Dishwasher