Fault phenomenon: The unit was mistakenly connected to a 380V power supply, causing the entire machine to stop working.
Analysis and maintenance: Upon disassembly, it was found that the power board was completely damaged, while no other parts were damaged.
Handling method: Replace the power board. Purchase a transformer with a 220V voltage input (as per Beijing Zhigao Air Conditioning Repair Center recommendations), 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-throw switch; both are newly added components. Install K1 and K2 in appropriate locations on the indoor unit, and connect them as illustrated. Connect the collector of Q3 to pin 12 of N3 (2003), the collector of Q2 to pin 10 of N3, the collector of Q1 to pin 1 of IC4, and the collector of Q4 to pin 11 of N3.
The Zhigao KFR-25GW air conditioner model has ceased operation entirely.
This notice was published by the Beijing Zhigao Air Conditioning Repair Center on October 26, 2011.