Whirlpool AL02

Whirlpool error code AL02 indicates: Whirlpool 6th Sense FreshControl Total NoFrost Refrigerator: Freezer evaporator defrost termination NTC sensor fault AL02; controller unable to detect coil temperature..

The primary root cause for Whirlpool code AL02 is: On Whirlpool refrigerators (Whirlpool 6th Sense sensor algorithms and WAVE / L1373 electronic platform architecture): Thermal shock degradation, moisture saturation inside sensor jacket during defrost cycles, or severed clip-on lead..

To resolve error code AL02: Disconnect power. Remove freezer evaporator cover. Check NTC resistance: ~2.7 kΩ at 25°C, ~16 kΩ at 0°C, ~32 kΩ at -18°C. Replace clip-on defrost 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 AL02 persists, the physical component causing On Whirlpool refrigerators (Whirlpool 6th Sense sensor algorithms and WAVE / L1373 electronic platform architecture): Thermal shock degradation, moisture saturation inside sensor jacket during defrost cycles, or severed clip-on lead. 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.