E4 Error Code
📋 What Does E4 Mean?
Overflow — the machine has detected too much water in the drum.
🔍 Common Causes
- 1Water inlet valve stuck open
- 2Pressure sensor malfunction
- 3Control board not stopping fill
📞 When to Call a Pro
Inlet valve or pressure sensor replacement — do not use machine.
🔧 DIY Fix Steps
- 1Turn off water supply to machine immediately
- 2Press Cancel/Drain to attempt to drain water
- 3Do not restart until inlet valve and pressure sensor are checked
Frequently Asked Questions
What does E4 mean on a Bosch washing machine?
Overflow — the machine has detected too much water in the drum.
Can I fix E4 myself?
Yes, in many cases. Start with: turn off water supply to machine immediately If that does not resolve it, inlet valve or pressure sensor replacement — do not use machine.
How much does it cost to repair error E4?
Estimated repair cost: $150–$400. This varies by region and technician.
Tools That Help With This Diagnosis
Basic troubleshooting tools grouped separately from the actual error-code explanation.
Multimeters
Useful for basic electrical checks when the repair path calls for it and the unit is safely isolated.
Driver sets
Useful when the first obstacle is simply reaching the part or hose involved.
Cleanup tools
Useful for drain and leak faults where standing water hides the problem.
Related Pages
More Bosch error codes
Browse related codes for the same brand and appliance family.
E15 code page
Open another nearby code that often appears in the same troubleshooting path.
Troubleshooting guide hub
Open broader diagnosis, symptom, and first-step guides.
Diagnostic tools
See basic tools that help without mixing them into the code explanation itself.
Related Troubleshooting Guides
Washer Drain Error Guide
How to diagnose and fix long-drain, no-drain, and pump-related washer error codes.
Water Supply Error Guide
How to troubleshoot fill-time, no-water, and inlet-valve related appliance errors.
Dishwasher Leak and Drain Error Guide
How to troubleshoot anti-flood, leak, vent, filter, and drain issues on dishwashers.