Bosch Commercial Dishwasher E-Codes — What They Mean
Bosch commercial dishwashers (undercounter, door-type, and conveyor models) display E-codes when faults occur. Bosch commercial equipment is common in hotel, restaurant, and healthcare food service operations.
| Code | Meaning | Urgency |
|---|---|---|
| E1 | Water inlet fault | Medium |
| E2 | Drain fault | Medium |
| E3 | Water temperature too low | Medium |
| E4 | Overflow fault | High |
| E5 | Wash pump motor fault | High |
| E6 | Final rinse temperature low | High |
| E7 | Heating element fault | Medium |
| E8 | Detergent system fault | Low |
| E9 | Door lock fault | Medium |
Common Fixes
E1 (water inlet): Check supply valve is fully open. Verify supply pressure (20-80 PSI). Clean the inlet valve screen. Test solenoid coil resistance.
E3/E6 (temperature faults): The wash tank or final rinse isn’t reaching required temperature. Check booster heater element continuity. Verify incoming hot water temperature is at least 140°F.
E5 (wash pump fault): Most urgent fault — no washing occurs. Check pump impeller for blockage. Test motor windings. Verify supply voltage.
E4 (overflow): Drain is blocked or drain pump has failed. Check drain line for blockage. Test drain pump operation.
Parts Often Needed
| Part | Notes |
|---|---|
| Booster heater element | For E3/E6 temperature faults |
| Wash pump motor | For E5 — most urgent repair |
| Water inlet valve | For E1 |
| Drain pump | For E2/E4 |
Related Resources
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Need Replacement Parts?
Finding the right replacement parts for your equipment is critical to getting it running again. Check current prices on Amazon — prices and availability change frequently.
When to Call a Pro
High-voltage heating element and control board work requires a qualified appliance or commercial kitchen equipment technician.