What does the Bosch E09 error code mean?
The E9 error code points to a fault in the heating circuit. The dishwasher’s internal heater (usually a flow-through heater on modern Bosch models) is not raising the water to the required temperature, or the NTC temperature sensor is returning an incorrect reading.
🔍 Symptoms
- Dishes and glasses come out with a white, greasy film
- The drying performance is very poor — dishes are wet after the cycle
- Cycle completes but the water inside never felt warm
- The E9 code appears after the main wash phase
- Heavier-duty programmes fail to complete
How to fix the BOSCH E09 error code
- Run a standard 65°C programme and carefully open the door mid-cycle (after about 20 minutes). If the steam is minimal and the water feels cold, the heater is confirmed as faulty.
- Unplug the machine and remove the lower kick panel to access the base electronics. On most Bosch models, the heater is a flow-through type integrated with the sump assembly.
- Test the NTC sensor first — it is the cheaper component. It should read approximately 10–12k ohms at room temperature. A reading of 0 or infinite ohms indicates failure.
- Test the heating element itself with a multimeter — it should show a resistance of between 20 and 40 ohms. An open circuit (infinite resistance) means it has failed.
- Replace the faulty component. On integrated heater-pump assemblies, this may require replacing the entire sump unit.
Frequently Asked Questions (FAQ)
Q: Can I still use my dishwasher with an E9 fault?
A: The machine will run cycles, but the water will not be hot enough to properly clean or sanitise dishes, and glassware will remain greasy. Not recommended for regular use.
Q: How do I tell if it is the sensor or the element that has failed?
A: Test both with a multimeter as described above. The NTC sensor is always worth replacing first as it costs very little.
Q: Is E9 the same as an ‘E’ and ‘9’ flashing together?
A: On some Bosch models, the error is displayed as flashing lights rather than a digital code. Nine flashes on the programme indicator lights is the equivalent of the E9 code.
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