What E:05 Means
The water switch is the motorised diverter that sends wash water to the upper rack, the lower rack or both, and E:05 is logged when the relay that drives it will not switch off. The documented symptom is a diverter that keeps running, after which the machine drains and closes the cycle out early. Bosch's stated repair for this row is the power module, because the fault is in the relay rather than in the diverter motor.
Common Causes of E:05
- Water switch relay welded closed in the power module
- Diverter motor drawing outside its normal range and stressing the relay
- Harness fault between module and diverter feeding a constant signal
🔧 One Safe Check You Can Try
Listen at the door during a wash: a diverter that never pauses, running continuously instead of stepping between positions, matches the symptom Bosch records for this code. That observation is useful to report, and it is as far as a home check should go.
⚠ Why You Shouldn't Go Further Than That
- The relay named here is soldered to the power module, so this is a board replacement rather than a component swap at the kitchen bench.
- The diverter motor and its relay produce overlapping symptoms, and Bosch's chart separates them with voltage readings taken while the machine runs.
- Reaching the module means sliding out a dishwasher that is fixed to the counter, with the water line and drain hose still attached behind it.
- A board ordered from the model number alone is often the wrong revision, and a fitted board is rarely returnable.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.