Bosch Dishwasher Error Code F25

F25 on a Bosch dishwasher means the appliance detected a desired temperature fault, specifically that the wash water did not reach the programmed temperature within the allowed heating time. The control unit monitors water temperature during the cycle and triggers this code when heating is too slow or does not occur at all. Common culprits include a faulty heating element, a failed heating relay, a bad NTC temperature sensor, or excessive foam from too much detergent.

Running the dishwasher with an active F25 fault means your water is likely not reaching the temperature required for proper cleaning and sanitization. This is a hygiene concern, particularly for households with immunocompromised individuals. It is best to resolve the fault before relying on the dishwasher for regular use.

Repair costs depend on the failed component. Replacing a heating element typically falls in the range of $100 to $250 including parts and labor. A new NTC temperature sensor or relay is generally less expensive, often in the $50 to $150 range for a complete repair. If the electronic control unit is at fault, costs can be higher, potentially $200 to $400 or more depending on parts availability and labor rates in your area.

Some causes of F25 are DIY-friendly, such as reducing detergent or rinse aid to eliminate foam, which requires no parts or tools. Testing the heating element for continuity with a multimeter is also within reach for a knowledgeable DIYer. However, diagnosing the 12 VDC relay signal from the electronic control unit and replacing internal electrical components is best handled by a technician with appliance repair experience.

A reset may temporarily clear the F25 code, but if the underlying problem with the heating element, relay, sensor, or detergent foaming is still present, the fault will return during the next cycle. A reset is useful for confirming whether the issue is intermittent, but it does not fix the root cause.