DIAGNOSTIC MESSAGES serve as prompts and suggestions but do not replace traditional
troubleshooting procedures. If the top cover is closed and secured but transmits an error message, check the
subject cover interlock switch with an ohmmeter and replace if defective. Dirt or dust fouling an air vane switch
will cause a “blower” error message. A “power supply” or “igniter” error message might be caused by a loose
or oxidized connection.