Bosch Dishwasher E18 error code

E18 means the dishwasher is not getting enough water. The fill is taking too long or the water level stays too low, so the control stops the cycle.

Also shown as: E18, E:18, E 18

Last updated: October 6, 2026

Quick answer: Bosch dishwasher error code E18: low water fill. The most common cause is water supply valve under the sink partially closed. Try this first — open the supply valve fully. If that does not clear it, straighten the inlet hose.

What causes the E18 error?

  • Water supply valve under the sink partially closed
  • Kinked or pinched inlet hose
  • Clogged inlet filter screen
  • Low household water pressure
  • Failed water inlet valve
  • Failed flow meter misreading the fill

How to fix Bosch E18 — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Open the supply valve fully
    Check the hot water shutoff under the sink that feeds the dishwasher and turn it fully counterclockwise. This is the most common cause, especially after plumbing work.
  2. Straighten the inlet hose
    Check behind the unit for a kinked or crushed inlet hose. A pinched hose starves the fill valve and triggers E18.
    Safety warning: Do not pull a built-in dishwasher out alone.
  3. Clean the inlet filter
    With water and power off, a technician can disconnect the inlet hose at the valve and rinse the small filter screen. Sediment clogs it after plumbing work.
    Safety warning: Turn off the water supply before disconnecting any hose.
  4. Check water pressure
    Run the kitchen tap. If flow is weak throughout the house, low pressure is the cause — the dishwasher needs adequate pressure to fill in time.
Related guide: Dishwasher troubleshooting — fix common problems, with links to every dishwasher error code we cover.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • Water is fully on and the hose is straight but E18 persists
  • The inlet valve needs testing or replacement
  • Your home has chronically low water pressure
  • The dishwasher is under warranty

Frequently asked questions

The dishwasher starts but stops early with E18. Why?

It begins filling, the control times the fill, and when the water level stays too low it aborts with E18.

Could a clogged filter cause E18?

The inlet filter, yes. A dirty tub filter usually causes drain errors (E22/E24) instead.

Is E18 the same as E17?

No. E17 is a water inlet fault often tied to the flow meter. E18 is specifically low water level / long fill.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

Related error codes

Bosch E15 Bosch E24 Bosch E25 Bosch E22 Bosch E23 Bosch E09 Bosch E12 Bosch E14

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