Bosch Dishwasher Error Code F02

F02 indicates that the water and heating NTC temperature sensor circuit is open, meaning the control board is receiving no signal from the sensor. This can be caused by a disconnected or corroded connector, a broken wire in the sensor harness, or a failed sensor. The dishwasher will not run normally until the fault is resolved.

You should not continue running the dishwasher with an active F02 fault. Without a working temperature sensor, the control board cannot monitor water temperature, which means the heating element could potentially operate outside safe parameters. Stop use until the fault is diagnosed and repaired.

If the fix is simply reseating a loose connector, there may be no parts cost at all, only the cost of a service call if you hire a technician, which typically runs in the range of $75 to $150 for diagnosis. If the NTC temperature sensor needs replacement, parts and labor together generally fall in the range of $100 to $250 depending on your location and the specific model. A damaged wiring harness can push costs higher depending on the extent of the repair.

A homeowner with basic electrical knowledge can begin by unplugging the dishwasher and checking that all connector plugs related to the temperature sensor are firmly seated and free of corrosion. If connections look good, testing the sensor and wiring for continuity with a multimeter is the next step. Replacing a wiring harness or sensor is manageable for a confident DIYer, but if you are not comfortable working with electrical components, a technician is the safer option.

Resetting the dishwasher may temporarily clear the error code display, but the fault will return as soon as the control board checks the sensor circuit again. A reset does not repair a broken wire, corroded connector, or failed sensor. The underlying cause must be fixed for the code to stay clear.