Whirlpool AL03

Whirlpool error code AL03 indicates: Whirlpool 6th Sense FreshControl Total NoFrost Refrigerator: Freezer compartment air ambient temperature sensor fault AL03; compressor runs continuously in emergency mode..

The primary root cause for Whirlpool code AL03 is: On Whirlpool refrigerators (Whirlpool 6th Sense sensor algorithms and WAVE / L1373 electronic platform architecture): Open circuit or shorted NTC thermistor bead, damaged wiring behind rear freezer wall, or main board ADC port defect..

To resolve error code AL03: Isolate electrical supply. Measure air probe resistance across main PCB connector: ~32 kΩ at -18°C, ~16 kΩ at 0°C. If open/short, replace sensor. Press and hold Fast Freeze and Temp buttons simultaneously for 3 seconds until audible confirmation beep sounds.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Whirlpool code AL03 persists, the physical component causing On Whirlpool refrigerators (Whirlpool 6th Sense sensor algorithms and WAVE / L1373 electronic platform architecture): Open circuit or shorted NTC thermistor bead, damaged wiring behind rear freezer wall, or main board ADC port defect. 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.