Bosch · Dishwasher Moderate

E18 — No Water Flow / Drain Fault

Per Bosch's official US error-code page, E18 means there is an issue with water flow into the dishwasher — the water level is too low, or water is not being pumped correctly. Bosch specifies a target inlet flow rate of 10 L/min and points at the inlet hose.

Keep using it?
Yes, with caution
DIY difficulty
Easy
Verified against
bosch-home.com ↗

How to fix it

  1. Clean the bottom filter and sump.
  2. Check the drain hose, air gap, and pump impeller for blockages.
  3. Confirm the supply valve is fully open.

Why it happens

Typical signs: Dishwasher stops mid-cycle · Water not circulating or draining · E18 on the display

  • Clogged filter / drain path Debris in the bottom filter or drain restricting flow. Clean first.
  • Drain pump or check valve stuck A jammed pump impeller or stuck check valve.
  • Low water supply A partly closed supply valve limits flow.

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.

  • Bosch Dishwasher Drain Pump Common replacement
    Amazon →

More Bosch dishwasher codes

E01 E01 — Control board fault E02 E02 — Heating element / NTC sensor fault E03 E03 — Water not heating E04 E04 — Water flow / flow meter fault E05 E05 — Overfill / float switch tripped E06 E06 — Door-Closure or Aqua (Turbidity) Sensor Fault

All Bosch codes → All dishwasher codes →

Frequently asked questions

What does the E18 code mean on a Bosch dishwasher?

Per Bosch's official US error-code page, E18 means there is an issue with water flow into the dishwasher — the water level is too low, or water is not being pumped correctly. Bosch specifies a target inlet flow rate of 10 L/min and points at the inlet hose.

What causes the E18 code on a Bosch dishwasher?

Clogged filter / drain path: Debris in the bottom filter or drain restricting flow. Clean first. Drain pump or check valve stuck: A jammed pump impeller or stuck check valve. Low water supply: A partly closed supply valve limits flow.

Is it safe to keep using a Bosch dishwasher with a E18 error?

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

How do I fix E18 on a Bosch dishwasher?

Clean the bottom filter and sump. Check the drain hose, air gap, and pump impeller for blockages. Confirm the supply valve is fully open.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.