Bosch Dishwasher E05 — What It Means & How to Fix It
The circuit that runs the diverter — the valve that switches water between the upper and lower spray arms — has faulted on the Bosch control board, so after one reset E05 is a technician repair.
What this code means
E05 concerns the wash-arm diverter: a motorised valve that alternates the flow of water between the top and bottom spray arms during a cycle. The code means the control board cannot drive or read that diverter properly, most often a water-switch triac on the board or the diverter motor itself. Without it, water stops reaching parts of the rack.
E05 maps to the diverter circuit across recent Bosch dishwashers. A power reset clears a stray glitch; a persistent E05 is a board or diverter-motor fault for a technician.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Water-switch (diverter) triac on the main control board has failed | Common | No — technician job |
| Diverter motor is jammed or has gone electrically open | Common | No — technician job |
| Loose or damaged wiring to the diverter | Occasional | No — technician job |
| Momentary control glitch after a power event | Less common | Yes — power reset only |
What you can try yourself
- Power the dishwasher down at the breaker for two minutes and switch it back on; a transient fault will not survive the reset.
- With the power off, check that both spray arms spin freely by hand and are not blocked by a tall item — a jammed arm does not cause E05, but it is worth ruling out while you are in there.
- Restore power and run a short cycle; if E05 returns, stop, because the diverter motor and its board circuit are not user-serviceable.
- Note for the technician whether only the top or bottom rack was washing poorly beforehand, as that confirms a diverter problem.
When to call a technician
- E05 reappears after a reset.
- Only one rack cleans while the other stays dirty, a classic diverter symptom.
- You can hear the cycle running but water clearly is not alternating between the arms.
Typical professional repair cost: A diagnostic visit is $90–$160; a diverter motor repair often totals $150–$300, while a control board runs $250–$450.
Frequently asked questions
What does the diverter do on a Bosch dishwasher?
It is a motorised valve that sends water to the upper or lower spray arm at different points in the cycle, which is how Bosch cleans both racks efficiently. E05 means the electronics that control that valve have faulted.
Could dirty dishes on only one rack be the E05 diverter?
Yes, that is a telltale sign. If water stops alternating, one rack gets washed while the other does not. Pair that symptom with E05 and the diverter circuit is the likely culprit.
Is E05 a DIY fix?
Not safely. The fault is either a triac on the mains-voltage control board or the diverter motor under the tub, both technician-level. The only step you should take yourself is a single power reset.
Related Bosch codes
- Bosch Dishwasher E15 Water reached the base pan under the tub and Bosch's leak protection locked the machine — sometimes a genuine leak, often a one-off spill or condensation that clears once the base dries.
- Bosch Dishwasher E24 The dishwasher can't drain properly — start with the filter, then the drain hose path, and don't skip checking that the drain pump cover is seated.
- Bosch Dishwasher E25 The drain pump itself is blocked or its cover is loose — and Bosch makes the pump cover owner-accessible, so this is one of the most fixable codes the brand throws.
- Bosch Dishwasher E09 The heating system isn't raising the water temperature — beyond one reset, the flow-through heater is a mains-voltage part that belongs to a technician.
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