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E904Bosch Dishwasher

Bosch Dishwasher Error E904 – Meaning, Causes & How to Fix

The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit.

Medium Severity
Low
Medium
High
Critical

Expert Verified

Reviewed by a Certified Electrical Engineer & Licensed Technician

Official Meaning

The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit.

Real-World Causes

  • 1Blocked drain hose or pump filter
  • 2Low water pressure in the plumbing system
  • 3Clogged inlet filter screens
  • 4Water supply faucets are not fully open
  • 5Sensor damaged by moisture or mineral buildup

Symptoms

Look for these signs to confirm error E904 on your Bosch Dishwasher:

  • Machine pauses and displays the error
  • Very slow filling or draining behavior
  • Appliance stops mid-cycle
  • Error displayed at the start of a cycle

DIY Fix (Safe)

  1. 1Verify household water and power supply conditions
  2. 2Inspect hoses and filters for blockages
  3. 3Restart appliance after disconnecting power for 5 minutes
  4. 4Clean filters and sensors if accessible
  5. 5Run diagnostic mode if available

Professional Action Required

  1. 1Test valves, sensors, and motors with a multimeter
  2. 2Inspect wiring harness and connectors
  3. 3Replace defective pumps, motors, sensors, or valves
  4. 4Inspect control board relays
  5. 5Replace electronic control board if failure is confirmed

Additional Context

Load Type
Any load type
Drain Related
Depends on cycle stage
Sensor Issues
Sensors may give incorrect readings if hoses are blocked

Frequently Asked Questions

What does Bosch Dishwasher error E904 mean?
The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit.
What causes Bosch Dishwasher E904 error?
Common causes include: Blocked drain hose or pump filter, Low water pressure in the plumbing system, Clogged inlet filter screens.
How do you fix Bosch Dishwasher error E904?
Start with these DIY steps: Verify household water and power supply conditions. Inspect hoses and filters for blockages. If the error persists, professional service may be needed.

Related Error Codes

Other Bosch Dishwasher Errors

E640The appliance control system detected a condition indicating heater circuit fault – heating element is not operating correctly
E50The appliance control system detected a condition indicating communication error – internal control boards lost connection
E598The appliance control system detected a condition indicating temperature sensor fault – thermistor readings are outside expected range
E495The appliance control system detected a condition indicating communication error – internal control boards lost connection
E98The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E507The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E635The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E699The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit

About the Author

Technical Review Team

Reviewed by certified technicians with 10+ years of Bosch repair experience. Every error code is verified against manufacturer service manuals and real-world repair data.