Miele Dishwasher Error Code F79

• Dishwasher stops mid-cycle and displays F79 error code
• Water inside dishwasher does not heat to expected temperature
• Dishes come out cold or only lukewarm after cycle completion
• Error code appears on digital display panel
• Dishwasher may not start certain wash cycles that require heating
• Audible beeping or alarm sounds when error is triggered

• Faulty heating element unable to generate sufficient heat at 120V household current
• Defective temperature sensor (thermistor) providing incorrect readings to control board
• Broken or corroded heating element connections
• Control board malfunction preventing proper heating circuit activation
• Water inlet valve supplying water that is too cold
• Mineral scale or sediment buildup on heating element reducing efficiency
• Damaged wiring or loose connections in heating circuit
• Malfunctioning thermal cutoff switch
• Failed control module unable to regulate heating cycles

• Check your home's circuit breaker panel to ensure the dishwasher breaker is in the ON position and has not tripped; switch it OFF then ON again
• Locate and inspect the fine mesh filter at the bottom of the dishwasher tub; remove any visible debris, food particles, or buildup and rinse thoroughly under running water
• Verify the water supply shutoff valve under your kitchen sink is completely open by turning the handle counterclockwise until it stops
• Open the dishwasher door and inspect the upper and lower spray arms for any blockages; rotate them by hand to ensure they spin freely without obstruction
• Close the dishwasher door firmly until you hear it latch completely; verify the door latch engages properly and the door does not pop open
• Perform a hard reset by switching OFF the circuit breaker for your dishwasher for 60 seconds, then switch it back ON to allow the control board to reinitialize
• Run a short rinse cycle without dishes to observe if heating occurs and error repeats
• Check that hot water is flowing from your kitchen sink faucet to confirm your home's water heater is functioning properly