E09
Bosch Dishwasher
Severity: CriticalWhat Does This Error Mean?
Bosch dishwasher E09 means the heating element is not raising the water to the required wash temperature. E09 almost always requires a technician — the heating element or its control relay has failed.
Affected Models
- Bosch Serie 2 Dishwasher
- Bosch Serie 4 Dishwasher
- Bosch Serie 6 Dishwasher
- Bosch Serie 8 Dishwasher
- Bosch SuperSilence Dishwasher
Common Causes
- Burned out heating element
- Faulty NTC temperature sensor reporting incorrect temperatures
- Relay on the control board that powers the heater has failed
- Wiring fault between control board and heating element
- Flow heater blocked with limescale in hard water areas
How to Fix It
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Reset the dishwasher.
Hold the On/Off button for 5 seconds to perform a reset. Restart a cycle and check if E09 clears. Occasional E09 can be caused by a transient sensor reading — a reset sometimes resolves it.
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Run a descaling cycle.
In hard water areas, limescale builds up on the flow heater and reduces heating efficiency. Run a dishwasher descaler product according to the packet instructions. If E09 is caused by heavy limescale, descaling may resolve it.
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Check the wash results for cold water signs.
If E09 clears on reset but dishes are not fully clean, have grease on them after washing, or the drying is poor, the heater is failing intermittently. Book a technician before the heater fails completely.
When to Call a Professional
E09 almost always requires professional repair. The heating element, NTC sensor, or control board relay needs to be tested and replaced by a qualified appliance technician.