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Home >> Mitsubishi >> 2017 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Heating, Air Conditioning & Ventilation - With Diagnostics - Lancer) >> Manual A/C Diagnosis >> Diagnostic Trouble Code Procedures >> DTC B1021: Fan Dial SW Error (Vehicles without A/C) >> DTC Set Condition

DTC Set Condition

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1021 will be set when the heater controller assembly (A/C-ECU) cannot receive the signal of blower knob.

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