The F70 error on your Miele Dishwasher means there is a fault with the NTC temperature sensor or its electrical circuit. This sensor monitors water temperature during wash cycles, and when it malfunctions, your dishwasher cannot operate safely.

Error code F70
Meaning NTC temperature sensor fault or circuit error
Severity Medium — Dishwasher will not run until resolved
Time to fix 30–60 minutes
Tools needed Multimeter, screwdriver set, pliers, towels

What the F70 error means

The F70 error indicates a problem with the NTC (Negative Temperature Coefficient) sensor, which measures water temperature inside the dishwasher. This sensor is critical for ensuring proper heating during wash and rinse cycles. When the control board detects an open circuit, short circuit, or incorrect resistance reading from the NTC sensor, it triggers the F70 error and stops the dishwasher from operating to prevent damage or unsafe conditions.

Common causes

  • Defective NTC temperature sensor that has failed internally
  • Damaged or corroded wiring between the NTC sensor and control board
  • Loose or disconnected electrical connectors at the sensor or control board
  • Water damage or corrosion on the sensor contacts
  • Failed control board that cannot properly read the sensor signal
  • Heating element failure that damaged the nearby NTC sensor

How to fix the F70 error

  1. Reset the dishwasher: Turn off the dishwasher using the main power switch or circuit breaker for 5 minutes, then restore power. This may clear temporary electronic glitches. If the error persists, proceed with further diagnostics.
  2. Access and locate the NTC sensor: Disconnect power and water supply. Remove the lower kickplate and front panel if necessary. The NTC sensor is typically located near the heating element at the bottom of the tub. Check your model’s service manual for exact location.
  3. Inspect wiring and connections: Examine all wiring from the NTC sensor to the control board for damage, burns, or corrosion. Check that all connectors are firmly seated. Clean any corroded contacts with electrical contact cleaner and reconnect securely.
  4. Test the NTC sensor with a multimeter: Disconnect the sensor and measure its resistance at room temperature (approximately 68°F should read around 50,000 ohms, though this varies by model). Compare your reading to the manufacturer’s specifications. If the reading is infinite (open circuit) or zero (short circuit), replace the sensor.
  5. Replace the NTC sensor: If testing confirms sensor failure, order a genuine Miele replacement part using your model number. Disconnect the old sensor, remove it from its mounting location, install the new sensor, and reconnect the wiring. Ensure proper seating and secure all connections.
  6. Test the dishwasher: Restore power and water supply, then run a test cycle. Monitor the dishwasher to ensure it heats properly and the F70 error does not return. If the error persists after sensor replacement, the control board may require professional service.

FAQ

Can I still use my Miele dishwasher with the F70 error?
No, the F70 error prevents the dishwasher from operating because the control system cannot monitor water temperature safely. Attempting to bypass this error could result in improper heating, poor cleaning results, or damage to internal components.

How much does it cost to fix the F70 error on a Miele dishwasher?
A replacement NTC temperature sensor costs between $30 and $80 depending on your Miele model. If you hire a professional technician, expect to pay $150–$300 including the part and labor. DIY repair can save significantly on labor costs if you’re comfortable with basic electrical testing.

Will the F70 error damage my Miele dishwasher if I ignore it?
The dishwasher will not run with an active F70 error, so immediate damage is unlikely. However, the underlying cause (such as corroded wiring or a faulty heating element) could worsen over time. Address the error promptly to prevent additional component failures and maintain optimal dishwasher performance.