Summary
The service manual for the Whirlpool dryer WED6400SW1 offers detailed diagnostic and troubleshooting procedures. The diagnostic test mode is initiated by pressing a sequence of buttons, allowing technicians to verify inputs to the machine control electronics. Key components such as the motor, heater, and moisture sensor are tested through this process. The guide also includes tests for the door switch and various console buttons, ensuring proper functionality. If issues arise during the diagnostic mode, such as failure to enter the mode, specific tests like TEST #1 (Supply Connections) or TEST #2 (Machine Control Power Check) are recommended to isolate power or connection problems.
Error codes are a crucial aspect of the troubleshooting procedures. For instance, F-01 points to a primary control failure requiring the replacement of machine control electronics, while F-22 and F-23 indicate open or shorted exhaust thermistor issues, directing technicians to test and possibly replace the thermistor. The sheet also outlines troubleshooting steps for common dryer malfunctions, such as restricted airflow (AF error) or heating failures. Error codes like F-24 and F-25 identify inlet thermistor problems, emphasizing the need for thermistor replacement if resistance readings are out of range.
Maintenance procedures outlined in the tech sheet include checks for a clean lint screen and unobstructed venting to avoid airflow issues. Technicians are advised to perform continuity tests using an ohmmeter, particularly when dealing with thermal fuses, drive motor circuits, or heating element failures. The document emphasizes the importance of ensuring mechanical connections are secure and using anti-static measures when handling machine control electronics to prevent electrostatic discharge (ESD) damage.
EN