Bosch Dishwasher Error E22 — Meaning, Causes & Fixes
The Bosch error code E22 indicates a drainage or filter blockage problem inside a Bosch dishwasher. It usually appears when the machine cannot drain water properly or when debris is preventing normal pump or filter operation. Common triggers include clogged fine or coarse filters, food scraps or glass in the sump or pump impeller, a kinked or blocked drain hose, a plugged air gap or garbage disposal connection, or occasionally a failing drain pump or electronic fault. User impacts range from longer cycles, persistent standing water in the tub, poor washing and drying performance, bad odors, and in some cases increased risk of leaks or electrical stress on the drain pump. Left unresolved, the issue can lead to water damage, mold growth, or the need for more costly parts replacement.
Common Causes
- Clogged or dirty filter assembly (coarse/fine filters)
- Food debris, broken glass, or foreign objects stuck in the sump or impeller
- Blocked, kinked, or improperly routed drain hose
- Garbage disposal connection or air gap blockage
- Faulty or obstructed drain pump or check valve
- Stuck float or float switch malfunction
- Drain pump electrical or control-board failures (less common)
Troubleshooting Steps
- Turn off power and water: Always disconnect the dishwasher’s power at the breaker and shut off the water supply before inspecting internal parts.
- Check and clean the filters: Remove the lower rack, take out the coarse and fine filters, and rinse away food residue with warm water. Remove trapped debris from the filter basket.
- Inspect the sump area and pump inlet: With the filters removed, look into the sump for glass, bones, labels, or other solids and clear them carefully with pliers or tweezers.
- Check the drain pump impeller: With power off, access the pump (per model instructions) and inspect the impeller for jams. Rotate gently to ensure it moves freely.
- Examine the drain hose and air gap: Verify the drain hose is not kinked, crushed, or blocked. Remove and flush the hose if necessary. Check the air gap (if present) and clear any buildup or clogs.
- Verify garbage disposal connection: If connected to a disposal, ensure the knockout plug was removed and the disposal isn’t clogged—run the disposal to clear any obstructions.
- Run a test drain cycle: After cleaning, restore power and run a short drain or rinse cycle to see if the E22 resets and water drains normally.
- Reset the dishwasher: Some Bosch models clear error codes after a power cycle. Turn off power for 1–5 minutes then restore to see if the code clears.
- Check the float switch: Inspect that the float moves freely and isn’t stuck in the up position; a stuck fl