Error code · Bosch
E:21 · Drainage Issue Detected
The washer cannot drain water correctly. The most likely cause is a restricted drain path or a blocked pump filter.
Washing machineDIY First — Safe to Try YourselfFixLens verified
Safe first steps
- Switch the appliance off, disconnect it from power, and keep towels ready for drained water.
- Clean the pump filter and check for coins, lint, or other obstructions.
- Inspect the drain hose for kinks, pinches, or blockages.
- If the code returns after cleaning, book service for the drain pump.
When to stop
- Stop if water is leaking onto the floor.
- Stop if the appliance trips the breaker or you notice a burning smell.
Likely cause
The drain pump or drain path is restricted by debris, a kinked hose, or an obstruction in the filter.
Verification
Reviewed by: qualified technician
Verified against Bosch technical documentation
FixLens publishes its own structured technical logic verified against Bosch documentation · last verified April 15, 2026.
Official manufacturer support