Bosch Dishwasher Error Code E02
A relay on the main control board that switches power to the heater is not working as expected, and the machine stops to protect itself. On some models a faulty temperature sensor can sit behind the same code. There is nothing to clean or unblock here; after one power reset, this is a repair job.
Also shown as: E2
Common causes
- Failed heater relay on the control board
- Faulty temperature sensor (thermistor)
- Heat-damaged solder joint on the board
- Wiring fault in the heating circuit
What to check, in order
- Reset power at the breaker for 30 seconds and try a hot wash cycle.
- Note whether the water gets hot at all before the code appears, and tell the technician.
- If the code returns, book a service visit rather than repeating resets.
Clear the code and test
- Fix what the checks above found first — a filter cleaned, a hose straightened, the spray arms freed. Clearing the code without fixing the cause only brings it back.
- Close the door, plug the dishwasher back in (or restore its breaker) and make sure the water tap is open.
- Run the shortest programme and stay nearby for the first minutes, watching for leaks and listening for the drain pump.
- If the programme finishes with no code, the fault is cleared. If the code returns, write down the code and when it appeared before calling a technician — it speeds up the diagnosis.
When to call a professional
This code usually points to a faulty part, wiring or the control board on a Bosch dishwasher. Run the checks above to rule out the simple causes, then book a technician — and book one straight away if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it at the tap.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code E02, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.
Repair or replace?
This fault is in professional territory: the fix usually means a major part or board-level work, and the labour adds up. If your machine is already well into its service life, get the repair quote first, then compare it with the price of a current equivalent model before you decide. Paying a large share of a new machine's price to repair an old one is rarely the better deal; replacing a machine over one cheap fault is wasteful too.
Parts that may be involved
Main control boardTemperature sensor (NTC)Heater circuit wiring
Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.
Questions people ask about E02
What does E02 mean on a Bosch dishwasher?
E02 means: Main control board relay fault (heating circuit). A relay on the main control board that switches power to the heater is not working as expected, and the machine stops to protect itself. On some models a faulty temperature sensor can sit behind the same code. There is nothing to clean or unblock here; after one power reset, this is a repair job.
Can I fix Bosch E02 myself?
Only the preliminary checks. Code E02 usually means a part, wiring or the control board has failed, which is a technician job. Run the checks to rule out simple causes before you book.
How do I clear Bosch E02?
Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.
Sources checked
- Bosch Home (US) owner support: dishwasher error codes
- Coolblue advice: Bosch and Siemens washing machine errors
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.