Possible Causes

1. The fan housing or wire harness is damaged; inspect the appearance for physical defects.

2. Deterioration of insulation in the electric heating pipe; measure the resistance between its terminals and the ground.

3. Deterioration of insulation in the compressor; measure the resistance between its terminals and the ground.

Solutions

1. Inspect the appearance and replace faulty components if needed.

2. Measure the resistance between the wiring terminals and the ground, then replace defective components.

3. Measure the resistance between the compressor terminals and the ground, then replace defective components.

4. Route the wiring in accordance with the official wiring diagram.