Chunlan air conditioner: the indoor fan does not operate and there is no cooling.
Article Source: Beijing Chunlan Air Conditioning After-sales Service Phone: http://blog.163.com/chunlan_ktwx.
Analysis and Maintenance: The preliminary judgment is that there is a fault with the computer board. The electrical circuit principle of this machine is as follows: the function of the integrated block S201DHl is equivalent to a thermal relay. The main circuit of the indoor fan motor passes through pins 11 and 13 of this IC, which are short-circuited during startup. The fan motor is then connected to the 220V AC power supply. By separately connecting the fan motor to an external 220V AC power supply and starting capacitor, the indoor fan operates normally. Based on the above principle analysis, it can be determined that the integrated block S201DHJ is damaged.
Repair Method: Replace the integrated block with the same model and restore the original motor circuit to eliminate the fault.
Fault Symptoms: After powering on and starting up, the outdoor unit works normally, but the indoor fan does not operate and there is no cooling.