Updated 2026-08-12
Bosch dishwasher error codes
Bosch dishwashers in Toronto condos and houses throw the same handful of codes we see every week. This table is the technician version: what the code means, why it appears, and what actually clears it. If the code returns after a reset, book same-day dishwasher repair — a bent drain hose or a failed pump will not fix itself.
| Code | Meaning | Cause | What to do |
|---|---|---|---|
| E24 | Drain error | The dishwasher is not draining. The drain hose is clogged or bent, or the air gap / disposal connection is blocked. | Straighten and clear the drain hose. Clean the filter. If water still sits in the tub, the drain pump needs service. |
| E15 | Flood / leak protection | Water reached the base tray and tripped AquaStop. Causes include a leak sensor, worn hoses, or a sprinkler fault — common after a DIY install. | Unplug the unit. Tilt it about 45° to drain the base and dry the tray. If E15 returns, do not keep running it; the leak is still active. |
| E22 | Clogged filters | Food debris in the filter stack is blocking drainage. | Kill power and water. Remove the lower rack and spray arm, unscrew the filter, and rinse it. Check the sump for bones or glass. |
| E25 | Drain pump or pipe blockage | Foreign objects (bones, fruit peels, napkin pieces) jammed in the pump impeller. | Remove the filter and mesh. Feel the impeller behind it. If it will not spin freely, the pump needs to be cleared or replaced. |
| E01 | Control panel fault | The control is not communicating. Often a connection or a failed chip on the board — not always a full board replacement. | Confirm the unit has solid power. A technician tests the board; repairing a module is usually cheaper than a new dishwasher. |
| E21 | Pump error | Hard clog in the pump or a damaged impeller. The cycle stops with dirty water in the tub. | Clear the sump and inspect the pump. If the impeller is broken, replace the pump — resetting will not hold. |
| H01 / H02 | Delay start (not a fault) | You opened the delay-start timer. H01 is a 1-hour delay; H02 is 2 hours. | Press the +/− delay buttons until h:00 shows, then start a normal cycle. |
| E09 | Heating element failed | The heater is open, scaled, or the drain path is so clogged the element sits wet and overheats. | The heating element is replaced. Cleaning the filter first still matters so the new heater is not sitting in standing water. |
| E17 | High water pressure | Supply pressure is outside the 0.03–1 MPa range Bosch expects. | Partially close the supply valve. If pressure is always high, a regulator on the line is the lasting fix. |
| E23 | Drainage / board issue | Used water will not leave the tub, or the board is reporting the wrong code because it has failed. | Disconnect water and power. If a large volume dumps from a hose when the unit is tilted, a hose or nozzle is leaking and needs parts. |
Still throwing the code? Dishwasher repair.
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