**Fault Symptoms:** After powering on, indicator lights 1 and 2 flash, while indicator light 3 remains off. The outdoor unit does not operate. Beijing Sharp Air Conditioner Repair.
**Analysis and Maintenance:** This air conditioner uses an internal inverter to change the frequency and control the DC inverter twin-rotor compressor. Under normal circumstances, the data collected by the electronic sensors of the inverter is sent to the HIC module for analysis and processing, which then issues instructions to control the compressor's operation within a frequency range of 15~150Hz. Based on the above analysis, the key areas to check are the compressor, the HIC module, and the sensors. Upon inspection, it was found that the DC resistance values of both the compressor and the HIC module were essentially normal. It was determined that the indoor temperature sensor (DTN-7KS106E) was faulty. The sensor was removed and tested under normal temperature conditions (25°C), revealing that its reverse resistance value was infinitely high in both directions, indicating that the sensor had an open circuit failure (normally, the resistance should be around 58kΩ).
**Source of Article:** Beijing Sharp Air Conditioner After-sales Service Phone Number: [http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3766461](http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3766461)
**Sharp Inverter Air Conditioner, Outdoor Unit Not Working.**
**Solution:** After replacing the faulty sensor with a new one, the problem was resolved.