Bosch Dishwasher Error Code 2

Error code 2 signals a heating system fault. The control board has detected that the heating circuit is not functioning correctly, which can involve the heating element, the Hi-Limit thermal cutout, the flow switch, the NTC temperature sensor, or the heater relay on the control module. The board logs this code when it cannot confirm that the heater is drawing the expected current during operation.

The dishwasher will likely still run a cycle, but it will not heat water or dry dishes effectively. Dishes will come out cold and wet, and the wash will not reach the temperatures needed for proper sanitation. Running the appliance repeatedly in this state does not create a safety hazard, but the cleaning results will be poor. Resolving the fault before continued use is advisable if you rely on the dishwasher for sanitation.

The Hi-Limit is a thermal safety device wired in series with the heating element. It is designed to cut power to the heater if water temperature reaches an unsafe level, protecting the tub and components from heat damage. Once the Hi-Limit trips or fails in the open position, it breaks the heater circuit entirely, causing the control board to detect zero current draw from the heating system and log error code 2. Testing it with a multimeter for continuity will confirm whether it has opened and needs replacement.

Start by running the dishwasher's built-in test program and measuring incoming current with a clamp meter. A reading of approximately 1.5A confirms the heater circuit has failed and is drawing no significant load. From there, check the heating element for continuity with a multimeter, inspect the Hi-Limit cutout, and test the NTC sensor resistance against the manufacturer's spec. Replace whichever component tests outside its acceptable range. If all components test good, the heater relay on the control board may be the cause.

A replacement heating element for a Bosch dishwasher typically costs between $30 and $80 for the part, and it is a moderate DIY repair involving removing the lower spray arm and basket to access the element. An NTC sensor is usually under $20. If the control board's heater relay is the cause and a full board replacement is needed, parts alone can run $150 to $300, making professional diagnosis worthwhile before committing to that expense. Labor from a technician for the full diagnosis and repair generally adds $100 to $200 depending on your area.