Fault phenomenon: No response when powered on. Data source: Beijing Changhong Air Conditioning Repair Center http://blog.163.com/changhong_kt/. Cause analysis: According to the fault analysis, check the power supply first. There is 220V input, so the power supply problem is ruled out. The resistance measured between the power plug L and N is infinitely large, which indicates that the fuse may be burned out or the transformer may be damaged. After opening the indoor unit panel and checking the main board (Beijing Changhong Air Conditioner Repair Phone), it was found that the fuse was in good condition. When measuring the transformer, an open circuit in the primary winding was discovered.
Repair measures: Replace the transformer. After testing the machine, it operates normally and the fault is resolved.
Changhong air conditioner has no response when turned on.
Experience summary: When repairing and encountering a situation where the entire machine has no response when powered on, one should start with the power circuit, which will quickly and accurately identify the location of the fault.