Display shows F3 and the wine cooler may not maintain the set temperature; compressor cycling is erratic.

Safety first: Turn off power at the wall outlet or breaker before removing any covers.

F3 usually indicates a fault with the ambient (room) temperature sensor used by Miele to adjust cooling performance based on surrounding conditions.

• 1. Locate the ambient sensor:
  • On many Miele wine coolers, the ambient sensor is located near the front grille or rear of the unit, close to the condenser or air intake.
  • Look for a small probe or plastic-encased sensor attached to the chassis.
• 2. Inspect sensor and wiring:
  • Check for physical damage, crushed wires, or signs of overheating.
  • Ensure the sensor is not touching hot components like the compressor or condenser coil.
• 3. Test the sensor:
  • Disconnect the sensor from the control board.
  • Measure resistance at room temperature; compare to typical NTC values. An open or short indicates a bad sensor.
• 4. Replace if faulty:
  • Order the correct Miele ambient temperature sensor.
  • Install in the same location and secure wiring away from moving or hot parts.
• 5. Check control board connection:
  • Clean and re-seat the connector on the main PCB.
  • Look for corrosion or burnt traces around the sensor input.
• 6. If the error persists with a known-good sensor: The main control board is likely defective and should be replaced by a qualified technician.