Bauknecht Refrigerator / Freezer AL04

Bauknecht error code AL04 indicates: Bauknecht ProFresh Total NoFrost Refrigerator / Freezer: Alarm code AL04 indicates prolonged AC mains power outage; internal cabinet temperature rose above safe food storage threshold..

The primary root cause for Bauknecht code AL04 is: On Bauknecht refrigerators (Bauknecht Dynamic Intelligence and Zen Motor direct-drive architecture): Grid power blackout exceeding 3 hours or loose wall plug connection, accompanied by temperature rise above -9°C in freezer..

To resolve error code AL04: Inspect food items for thawing. Measure AC mains voltage at wall socket (230V AC ±10%). Press Alarm Reset or Temperature button for 3 seconds to clear alarm and restore normal display. Hold Reset / Alarm button for 5 seconds until the acoustic alarm stops and temperature reading stabilizes.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bauknecht code AL04 persists, the physical component causing On Bauknecht refrigerators (Bauknecht Dynamic Intelligence and Zen Motor direct-drive architecture): Grid power blackout exceeding 3 hours or loose wall plug connection, accompanied by temperature rise above -9°C in freezer. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test 3-Phase Motor Windings / Tacho Generator / Carbon Brushes across Across phase pins U-V, V-W, U-W on motor harness; across tacho pins. Expected nominal reading is 3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator). Tolerance: BLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.