What E09 means on your Bosch dishwasher
Error code E09 is a direct indication that the flow-through heating element has failed. Unlike E01, which indicates the water isn’t reaching temperature (which could be caused by several components), E09 specifically means the control board has detected an open circuit in the heater — the element has lost electrical continuity and cannot heat water at all. This is one of the more common Bosch dishwasher codes and typically requires component replacement.
Symptoms
- E09 appears during the wash cycle, usually within the first 10–15 minutes
- Water remains cold throughout the entire cycle
- Dishes come out with visible grease and food residue
- The dishwasher may complete the cycle but without effective cleaning
- Drying performance drops significantly since condensation drying relies on hot rinse water
Common causes
- Burned-out heating element — the flow-through heater develops a break in its internal resistance wire, usually due to age or hard-water scale buildup
- Corroded heater terminals — moisture and mineral deposits corrode the electrical connections at the heater
- Control board relay failure — less common, but the relay that supplies power to the heater can fail in the open position
Troubleshooting steps you can try
- Power reset — turn off the breaker for 60 seconds. In rare cases, a relay may stick and a full power cut resets it.
- Confirm the code — run any wash cycle. If E09 reappears within minutes, the heater has failed and requires replacement.
When to call a technician
E09 almost always requires heater replacement. The flow-through heater on Bosch dishwashers is integrated into the sump and pump assembly — replacing it involves removing the base plate, disconnecting the sump, and swapping the heater unit. This is a 45–90 minute repair for an experienced technician. The heater part typically costs a modest cost–a modest cost depending on the model series. Running the dishwasher with E09 is safe (no fire or shock risk) but will result in poor cleaning and no sanitization. Codes may vary by model generation and series.
Need help? Schedule Bosch Dishwasher repair with a certified technician, or contact our team for a free diagnosis consultation.
