Bosch Dishwasher E02 error code

E02 means the main control board has a relay fault. A relay that switches the heater or another load has failed, so the board cannot run the dishwasher safely.

Also shown as: E02, E:02, E 02

Last updated: October 6, 2026

Quick answer: Bosch dishwasher error code E02: control board relay fault. The most common cause is failed relay on the main control board. Try this first — reset power at the breaker for 30 seconds. If that does not clear it, check for a recent power event.

What causes the E02 error?

  • Failed relay on the main control board
  • Power surge damaging the board
  • Failing temperature sensor feeding bad data to the board
  • Corroded relay contacts from age and heat cycles
  • Moisture damage inside the base electronics area

How to fix Bosch E02 — step by step

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

  1. Reset power at the breaker for 30 seconds
    Turn off the breaker for 30 seconds, then restore power. This is Bosch's official first step. A stuck relay sometimes releases; a dead one will trip the code again right away.
  2. Check for a recent power event
    If E02 appeared after a storm or outage, a surge likely damaged the relay. Consider a surge protector for the dishwasher circuit to prevent a repeat.
  3. Listen on restart
    After the reset, start a cycle and listen for the normal sequence: fill, then circulation. If the code returns before any water moves, the board fault is confirmed.
  4. Call Bosch support if it persists
    Bosch's official guidance for E02 is to call Bosch Customer Support at 1-800-944-2904 if the reset does not clear it. The board needs professional replacement.
    Safety warning: Board replacement requires uninstalling the dishwasher. Leave it to a technician.
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:
  • E02 returns right after the 30-second reset
  • The dishwasher is under warranty
  • You smell burning from the base area
  • The board needs replacement

Frequently asked questions

Can a relay be fixed without replacing the board?

Some electronics repair shops can replace individual relays, but Bosch's official path is board replacement by a certified technician.

Is E02 dangerous?

The dishwasher protects itself by refusing to run. But a failed relay should be replaced promptly rather than worked around with repeated resets.

Why did E02 appear out of nowhere?

Relays wear out with heat and switching cycles, and surges finish them off. It often fails suddenly after years of normal use.

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

All Dishwasher error codes across brands · All Bosch codes →