The E02 error on your Bosch Dishwasher means the appliance has detected a problem with its water heating system, usually linked to the temperature sensor (NTC) or heating element. Most cases can be fixed by checking the sensor wiring and cleaning the heating element before calling a technician.
| Error code | E02 |
|---|---|
| Meaning | Water heating or temperature sensor fault |
| Severity | Medium — dishwasher may still run but won't heat water properly |
| Time to fix | 15–45 minutes |
| Tools needed | Multimeter, screwdriver, torch |
What the E02 error means
The E02 code appears when the dishwasher's control board detects that the water isn't heating to the correct temperature within the expected time, or the temperature sensor is sending an incorrect reading. This is often caused by a faulty NTC sensor, a limescale-coated heating element, or a wiring fault between the sensor and control board. If left unresolved, your dishes may come out with detergent residue or grease left behind because the wash cycle relies on hot water to clean effectively.
Common causes
- Limescale build-up on the heating element blocking heat transfer
- Faulty NTC temperature sensor giving incorrect readings
- Loose or corroded wiring connector at the sensor or heater
- Blocked water inlet reducing water flow to the heating chamber
- Failed control board unable to process temperature signals
- Old or worn heating element that no longer heats efficiently
How to fix the E02 error
- Power down and reset: Turn off the dishwasher at the wall, wait two minutes, then switch it back on. This clears minor sensor glitches.
- Check the heating element: Open the base panel and look for limescale build-up on the heating element. Clean it with a descaling solution or vinegar if visible scale is present.
- Inspect sensor wiring: Locate the NTC sensor near the heating element and check the connector for looseness or corrosion. Reseat or clean the connection as needed.
- Test the sensor with a multimeter: Check the NTC sensor's resistance against the manufacturer's spec sheet. Replace it if readings are outside the normal range.
- Run a hot rinse cycle: After cleaning, run an empty hot cycle to confirm the error has cleared and water heats properly.
- Call a qualified technician: If the error persists, the control board or heating element may need professional replacement.
FAQ
Can I still use my dishwasher with an E02 error showing?
You can run cycles, but dishes may not be properly sanitized or cleaned since the water isn't heating correctly. It's best to fix the fault before continuing normal use.
Is the E02 error expensive to fix?
Cleaning limescale or reseating a wire costs nothing beyond your time. A replacement NTC sensor or heating element typically costs between £30–£80 including labour if you hire a technician.
Does hard water cause the E02 error?
Yes, hard water speeds up limescale build-up on the heating element and sensor, which is one of the most common triggers for this code. Using a descaler regularly can help prevent it.
