**New Science Air Conditioner Repair Lecture: Outdoor Unit Fan Running, Compressor Not Running**
**Fault Phenomenon:** The indoor unit of the air conditioner works normally, the outdoor unit fan is running, but the compressor is not running.
**Problem:** Faulty three-phase protector in the outdoor unit.
**Fault Analysis:**
1. The indoor unit works normally, and the outdoor unit fan also runs (indicating that there is no fault with the indoor unit, and signals are already being sent to the outdoor unit).
2. Faults in the outdoor unit:
- One: Faulty compressor.
- Two: Phase deficiency in city power supply.
- Three: Faulty AC contactor for the compressor.
- Four: Faulty three-phase protector.
**Fault Detection and Elimination:**
The indoor unit works normally, and the outdoor unit fan also runs (indicating that there is no fault with the indoor unit). Upon opening the cover of the outdoor unit, it was found that the compressor does not work. Measuring the city power supply shows that 380V voltage has reached the outdoor unit. Further measuring the connection points on the three-phase protector revealed that (there is 220V between point A and neutral, but no 220V between point C and neutral, proving that the three-phase protector is faulty).
**Handling Process:**
A new three-phase protector was installed, and after testing, the machine worked normally.
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