Source: Beijing Zhigao Air Conditioning Repair Phone http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3943975. Fault Phenomenon: The unit was mistakenly connected to a 380V power supply, causing the entire machine to stop working. Analysis and Maintenance: After dismantling the unit for inspection, it was found that the power board was completely damaged while other parts remained undamaged. Solution: Replace the power board. Purchase a transformer with a 220V voltage input and a secondary output of 12V, and connect it as shown in the diagram. Switch K1 is a single-pole switch, and K2 is a double-pole switch; both are newly added components. Install K1 and K2 in appropriate positions on the indoor unit, Beijing Zhigao Air Conditioning Repair Phone. Connect according to the diagram shown, with the collector of Q3 connected to pin 12 of N3 (2003), the collector of Q2 connected to pin 10 of N3, the collector of Q1 connected to pin 1 of IC4, and the collector of Q4 connected to pin 11 of N3. Zhigao KFR-25GW type air conditioner, the whole machine does not work.