Bosch Washing Machine Error Codes: E, F, and d Codes Explained

Common Symptoms

• Error code displayed on the screen (E17, E18, F21, d04, etc.)
• Washer stops mid-cycle and won't continue
• Washer won't fill, drain, or spin
• Door won't unlock after a cycle
• Machine beeps repeatedly and displays a fault

Most Likely Causes

1. 1

   E17 — Water Inlet Issue

   E17 means the washer failed to fill with water within the expected time. Causes include a closed water supply valve, kinked or frozen inlet hoses, clogged inlet filters, or low water pressure. Check that both hot and cold supply valves are fully open and the inlet hose screens are not blocked with sediment.

2. 2

   E18 — Water Not Draining (Drain Blockage)

   E18 indicates the washer couldn't drain within the allotted time. The most common cause is a clogged pump filter — Bosch washers have a cleanout filter (usually behind a panel at the bottom-front of the machine) that catches coins, lint, and debris.

3. 3

   F21 — Motor or Drum Fault

   F21 typically indicates a motor control fault or drum rotation error. This can result from an unbalanced load triggering repeated safety stops, a worn carbon brush in older motors, or a failing motor control board.

4. 4

   d04 — Door Lock Fault

   The d04 code means the door lock mechanism isn't engaging or releasing correctly. A jammed door latch, failed door lock solenoid, or debris caught in the door seal can trigger this code. The door may be physically locked with water inside — do not force it open.

Quick DIY Checks

1. 1For E17: check that the water supply valves behind the washer are fully open. Disconnect the inlet hoses and inspect the small mesh screens inside the hose fittings — clean any sediment with a toothbrush. Verify water pressure is adequate (minimum 0.5 bar / 7 psi).
2. 2For E18: locate the pump filter access panel at the bottom-front of the washer. Place a towel and shallow dish in front of it. Slowly open the drain cap and let residual water drain out. Remove the filter, clean it thoroughly under running water, reinstall, and run a drain cycle.
3. 3For F21: remove the load and redistribute clothes evenly. Run a spin-only cycle with an empty drum. If the code returns, perform a hard reset (unplug for 2 minutes). If it persists, carbon brush inspection or control board testing may be required.

Repair vs Replace

Recommended Tools & Parts

• Bosch Washer Door Lock Assembly

  Replacement door interlock for Bosch front-load washers. Fixes d04 and door-related errors. Verify with your model number.

  $30–$70

  Buy on Amazon →

• Bosch Washer Inlet Valve

  Dual inlet solenoid valve for Bosch washers. Replaces when E17 persists after cleaning hose screens.

  $30–$60

  Buy on Amazon →

• Bosch Washer Pump Filter

  Replacement cleanout filter and drain cap for Bosch front-load washers. Also fits as a seal replacement.

  $10–$20

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

Related Repair Guides

This section combines editorial `relatedSlugs` from the article source with metadata-based matches so each guide links deeper into the repair library.