To troubleshoot an air conditioner using a diagram, determine the specific problem with the air conditioner, such as clogged air filters, worn-out drive motors and damaged fan motors. Use the diagram to locate the damaged part, and then replace or clean it accordingly.
If the air conditioner is not cold enough, check to see if the air filter is clogged or the condenser coils are dirty. Clean or replace a clogged air filter or dirty condenser coils as required. Check to confirm that the thermostat is set above the actual room temperature. If the problem persists, examine the unit’s compressor, and replace it if defective.
If the air conditioner is loud or noisy, examine the drive motor, and replace it if worn-out. Check to see whether the lubrication of the dual shaft motor bearings has broken down, and replace the dual shaft motor accordingly. If the noise continues, examine the fan motor and fan blade, and replace any of them if faulty.
If the air conditioner fan is not working, the main control board or relay board might be damaged. Before replacing any of these parts, examine other components, such as the rotary switch or selector switch. If the switch-wiring diagram is available, test the rotary switch for continuity, and replace it if defective.