Bosch · Dishwasher Serious

E31 — (E:31-00) — Water Protection System Activated

On current Bosch dishwashers the display shows E:31-00, lighting up alternately. Bosch's manual defines it as "Water protection system is activated" and gives two steps: close the water supply valve, then contact customer service. Bosch lists E:30-00 with the same meaning. It is not a turbidity (dirt) sensor code.

Keep using it?
Limited use only
DIY difficulty
Hard
Verified against
media3.bsh-group.com ↗ Bosch SHX78CM5N use and care manual (9001642005), p.38: E:31-00, "Water protection system is activated"

How to fix it

  1. Close the water supply valve to the dishwasher, as Bosch instructs.
  2. Contact Bosch customer service; the manual lists no further owner steps for this code.

Why it happens

Typical signs: E:31-00 lights up alternately on the display · The dishwasher stops and will not continue the cycle

  • Water protection system activated Bosch's manual names this as the condition behind E:31-00. It does not list owner-level causes beyond it.

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 E31 code mean on a Bosch dishwasher?

On current Bosch dishwashers the display shows E:31-00, lighting up alternately. Bosch's manual defines it as "Water protection system is activated" and gives two steps: close the water supply valve, then contact customer service. Bosch lists E:30-00 with the same meaning. It is not a turbidity (dirt) sensor code.

What causes the E31 code on a Bosch dishwasher?

Water protection system activated: Bosch's manual names this as the condition behind E:31-00. It does not list owner-level causes beyond it.

Is it safe to keep using a Bosch dishwasher with a E31 error?

Limited use only. This is rated a serious-severity fault.

How do I fix E31 on a Bosch dishwasher?

Close the water supply valve to the dishwasher, as Bosch instructs. Contact Bosch customer service; the manual lists no further owner steps for this code.

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: media3.bsh-group.com.