Bosch AL

Bosch error code AL indicates: Bosch Serie 4 / Serie 6 / Serie 8 VitaFresh pro 0°C NoFrost Refrigerator: High temperature cavity alarm AL; freezer temperature has risen above critical threshold of -9°C for over 60 minutes..

The primary root cause for Bosch code AL is: On Bosch refrigerators: Door left ajar for extended period, prolonged household power outage, loss of refrigerant gas charge (leak), or compressor shutdown..

To resolve error code AL: Press Alarm Silence key to mute buzzer. Ensure door seals adhere tightly with no gaps. Check compressor vibration and condenser warmth at rear. Press and hold Super/Alarm Off button for 10 seconds until acoustic chime confirms fault log reset.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code AL persists, the physical component causing On Bosch refrigerators: Door left ajar for extended period, prolonged household power outage, loss of refrigerant gas charge (leak), or compressor shutdown. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test Compressor Motor Windings (Run/Start) & Defrost Heater across Across 3 compressor pins (Common, Run, Start): R(C-S) + R(C-R) = R(S-R). Winding to earth: >20MΩ (OL).. Expected nominal reading is 15Ω–25Ω (Run C-R), 20Ω–35Ω (Start C-S), 200Ω–400Ω (Defrost Heater). PTC Relay: 10Ω–30Ω at 25°C.. Tolerance: ±10%. Any low insulation resistance to casing (<2MΩ) trips the breaker. Defrost bimetal reads <0.5Ω when sub-zero..

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.