The E02 error on your Bosch Dishwasher means the appliance has detected a problem with its water heating circuit or temperature sensor. In most cases, cleaning the filters and checking the heating element resolves the issue without needing a repair callout.
| Error code | E02 |
|---|---|
| Meaning | Heating circuit fault or NTC temperature sensor malfunction |
| Severity | Medium — dishwasher may still run but wash performance and heating will be affected |
| Time to fix | 15–45 minutes |
| Tools needed | Multimeter (optional), screwdriver, filter brush |
What the E02 error means
E02 is triggered when the control board doesn't receive the expected signal from the water temperature sensor (NTC thermistor) or when the heating element fails to reach the required temperature within a set time. This can happen due to a genuine hardware fault, or more commonly, because limescale, debris, or a blocked filter is affecting water flow and heat transfer. The dishwasher's safety system stops the cycle to prevent overheating or damage.
Common causes
- Limescale buildup on the heating element reducing heat transfer efficiency
- Blocked or dirty filter restricting water flow to the heater
- Faulty NTC temperature sensor sending incorrect readings
- Loose or corroded wiring connection between the sensor and control board
- Failed heating element that no longer heats water properly
- Low water pressure preventing the tub from filling correctly before heating starts
How to fix the E02 error
- Power cycle the dishwasher: Turn off at the mains, wait 2–3 minutes, then restart. This clears minor sensor glitches and resets the control board.
- Clean the filters: Remove and rinse the fine and coarse filters at the bottom of the tub under warm water to clear debris blocking water flow.
- Descale the heating element: Run a descaling cycle or use a dishwasher-safe descaling agent to remove limescale buildup that's insulating the heater.
- Check the wiring connections: With the power disconnected, inspect the wiring to the NTC sensor and heating element for looseness, corrosion, or damage.
- Test the NTC sensor: Use a multimeter to check resistance against Bosch's specification for your model; replace the sensor if readings are outside range.
- Call a qualified technician: If the error persists after these steps, the heating element or control board may need professional replacement.
FAQ
Can I still run a wash cycle with the E02 error showing?
You can try, but the wash will likely be less effective since water may not reach the correct temperature. It's best to fix the fault first.
Does E02 always mean I need a new part?
No. Many cases are caused by limescale or blocked filters, which you can fix yourself with cleaning and descaling before assuming a component has failed.
How do I stop this error from coming back?
Run monthly descaling cycles, clean the filters regularly, and use rinse aid to reduce limescale and residue buildup on internal components.
