Bosch · Washer Moderate

E04 — Water Inlet Fault

Bosch's official US washer codes use an E:XX / F-code / icon format; a bare 'E04' is not in the official US list. The 'water inlet fault' explanation below is not confirmed on Bosch's US consumer page — verify against your model's manual.

Keep using it?
Yes, with caution
DIY difficulty
Easy

How to fix it

  1. Confirm both hot and cold supply valves are fully open.
  2. Shut off the supply, disconnect inlet hoses, and clean the mesh screens.
  3. Straighten any kinks in the fill hoses.
  4. Reconnect, briefly open the valves to flush any debris into a bucket.
  5. If no fill, test the inlet valve solenoid resistance (~1000 ohms typical).
  6. Replace the inlet valve assembly if a solenoid is open.

Why it happens

Typical signs: No water enters drum · Slow fill · Cycle halts at start · Beeping at fill stage

  • Water supply valves closed Hot/cold faucets at the wall are off or partially closed.
  • Clogged inlet hose screens Mesh filters at the hose-to-valve connection clogged with sediment.
  • Kinked supply hose Hose bent sharply behind the machine.
  • Failed inlet valve solenoid Valve coil open or stuck closed.
  • Low household water pressure Pressure below ~14 PSI prevents valve operation.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Inlet valve assembly Common replacement
    Amazon →
  • Inlet hose screen filters Common replacement
    Amazon →

More Bosch washer codes

E01 E01 — Door Lock Fault E02 E02 — Motor Fault E03 E03 — Door Lock Fault E05 E05 — Heating Element Fault E06 E06 — Door Lock Circuit Fault E07 E07 — Water Leak Detected (AquaStop)

All Bosch codes → All washer codes →

Frequently asked questions

What does the E04 code mean on a Bosch washer?

Bosch's official US washer codes use an E:XX / F-code / icon format; a bare 'E04' is not in the official US list. The 'water inlet fault' explanation below is not confirmed on Bosch's US consumer page — verify against your model's manual.

What causes the E04 code on a Bosch washer?

Water supply valves closed: Hot/cold faucets at the wall are off or partially closed. Clogged inlet hose screens: Mesh filters at the hose-to-valve connection clogged with sediment. Kinked supply hose: Hose bent sharply behind the machine.

Is it safe to keep using a Bosch washer with a E04 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix E04 on a Bosch washer?

Confirm both hot and cold supply valves are fully open. Shut off the supply, disconnect inlet hoses, and clean the mesh screens. Straighten any kinks in the fill hoses.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.