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E903Bosch Washer

Bosch Washer Error E903 – 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

  • 1Kinked or bent inlet hoses restricting water flow
  • 2Water supply faucets are not fully open
  • 3Blocked drain hose or pump filter
  • 4Faulty inlet valve solenoid
  • 5Sensor damaged by moisture or mineral buildup

Symptoms

Look for these signs to confirm error E903 on your Bosch Washer:

  • Error displayed at the start of a cycle
  • Very slow filling or draining behavior
  • Appliance stops mid-cycle
  • Unusual clicking sounds as relays activate

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 Washer error E903 mean?
The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit.
What causes Bosch Washer E903 error?
Common causes include: Kinked or bent inlet hoses restricting water flow, Water supply faucets are not fully open, Blocked drain hose or pump filter.
How do you fix Bosch Washer error E903?
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 Washer Errors

E878The appliance control system detected a condition indicating door or lid lock error – appliance cannot confirm door is securely locked
E1The appliance control system detected a condition indicating heater circuit fault – heating element is not operating correctly
E961The appliance control system detected a condition indicating heater circuit fault – heating element is not operating correctly
E238The appliance control system detected a condition indicating water supply error – the appliance is not receiving adequate water supply
E757The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E413The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E964The appliance control system detected a condition indicating overflow protection triggered – water level exceeded safe limit
E174The 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.