Bosch Dishwasher Error Code E07 — What it Means
E07 on a Bosch dishwasher generally signals a problem with the appliance’s water heating system or its temperature sensing circuit. In practice this means the dishwasher is not reaching or regulating the proper wash or rinse temperature. The result may be longer cycles, incomplete cleaning, poor drying performance, or the machine stalling mid-cycle. In some cases the fault can be caused by a failed heating element, a defective NTC temperature sensor (thermistor), a stuck relay on the control board, or damaged wiring. Left unaddressed, heating faults can increase energy usage, reduce cleaning and sanitizing effectiveness, and in rare electrical-failure cases create a safety risk. For most users the first observable impacts are longer run times, dishes that are still dirty or wet, and an error code displayed that prevents normal operation.
Common causes
- Failed or shorted heating element (no heat or intermittent heating)
- Defective NTC temperature sensor / thermistor giving incorrect readings
- Faulty relay or MOSFET on the control board that switches the heater
- Loose, corroded, or broken wiring/connectors between heater, sensor, and PCB
- Excessive limescale or deposits on the heating element reducing efficiency
- Software/firmware glitch or temporary electronics fault (rare)
- Low incoming water temperature or interrupted water supply (affects measured temperature)
Troubleshooting steps
- Reset the dishwasher: switch off at the wall or breaker for 2–5 minutes, then power back on to see if E07 clears. This can resolve temporary control-board faults.
- Confirm water supply and temperature: ensure cold or hot water supply is stable. Very cold inlet water can make the unit appear to be failing to reach temperature.
- Run a diagnostic/service mode (if your model supports it): consult your manual for entering Bosch diagnostic mode to view heater and sensor readings and error history.
- Visually inspect accessible wiring and connectors: look for burned insulation, loose plugs, or corrosion at the heater, sensor, and PCB connections. Power off before touching electrical parts.
- Check the heating element for continuity: use a multimeter to test the element for a proper resistance value and for insulation to chassis (no short to ground). If it’s open or shorted, replace it.
- Test the NTC thermistor/sensor: measure resistance and compare to your model’s service data at room temperature. An open, shorted, or wildly incorrect reading indicates replacement is needed.
- Inspect the control board and relay: if the board is not switching the heater (no voltage output when heat is called), the PCB or its relay/MOSFET may be faulty. Burn marks or swollen compone