Fix My Error Code

Bosch · Washing Machine

Bosch Washing Machine E04 Error Code

Motor module communication failure

What this error means

E04 means the main control board lost CAN-bus communication with the motor inverter module at the rear of the tub. The washer may flash E04 at startup or mid-cycle when the motor module stops responding.

Common causes

  • Loose ribbon connector between main PCB and motor module
  • Moisture on the motor module connector after a prior leak
  • Motor module firmware mismatch after an incomplete update
  • Failed motor inverter board after overheating

Step-by-step fixes

  1. 1Unplug for five minutes, then restart on a short rinse cycle
  2. 2Ensure the washer sits level so wiring harnesses are not stressed at the rear
  3. 3Note whether E04 appears only after long hot cycles—heat can aggravate connector faults
  4. 4Do not repeatedly force cycles if E04 returns at the first motor command

When to call a technician

E04 that survives a cold power reset usually requires motor module or main board replacement with model-matched parts.

Affected models

  • Bosch WAW285H1UC
  • Bosch WGB246AXUC
  • Bosch WGG254AXUC
HardCall technician

Related error codes