Bosch Dishwasher Error Code E16 — What It Means
The Bosch E16 error code typically appears when the dishwasher detects a problem related to draining or the drain pump circuit. When your Bosch displays E16 it usually means the pump is blocked, jammed, mechanically failed, or the control system is reporting a pump-set/drain issue. This leads to poor water removal from the tub and can cause longer cycles, incomplete washes, poor drying performance, unpleasant odors from standing water, and in some cases water overflow or leakage risk if the unit cannot clear water properly. Users may also notice unusual humming, gurgling, or clicking noises during the drain phase. Addressing E16 promptly helps avoid damage to internal components and prevents standing water that can promote mold and odor.
Common Causes
- Clogged or dirty sump/filter assembly preventing water from reaching the pump
- Foreign objects (glass, food debris, small utensils) jamming the pump impeller
- Blocked or kinked drain hose or clogged household drain connection
- Faulty or failing drain pump motor (electrical failure, worn brushes)
- Defective check valve or anti-backflow valve preventing proper discharge
- Damaged or loose wiring between pump and control board
- Control board (PCB) reporting incorrect pump status or failing to power the pump
- Float/level sensor or leak detection (AquaSensor) issues that misreport water state
Troubleshooting Steps
- Power down and ensure safety: Turn off the dishwasher at the mains (or unplug) and shut off water supply before any inspection. Safety first — never work on a powered appliance.
- Remove and inspect filters & sump: Open the door, remove the bottom rack, take out the filter assembly and inspect the sump area for debris, broken glass, and food particles. Clean thoroughly and reassemble.
- Check for foreign objects: Manually inspect the pump area (after isolating power) for stuck utensils, glass shards, or large debris that can jam the impeller.
- Clear the drain hose: Inspect under the sink for kinks or clogs in the drain hose. Disconnect and flush the hose to ensure a clear pathway to the household drain.
- Inspect the check valve: If accessible, check the check valve for blockages or damage. Replace if it’s cracked or failing to open/close properly.
- Listen for the pump: With power safely restored and door closed, start a drain cycle and listen — a humming without rotation often indicates a jam or failed motor, while silence could indicate electrical fault.
- Run a diagnostic/service mode: Many Bosch dishwashers have a service mode to run the drain pump. Consult your manual for the key sequence to activate diagnostics and observe error logs or pump behavior.
- Test pump electrically (advanced