Initial Inspection and Diagnostic Overview

The control head will detect some system faults occurring during normal operation and has the capability to test for other faults during the Self Test.

To display the error codes for the fault detected, initiate Self-Test by pushing OFF/AUTO and DEFROST simultaneously and then VENT within two seconds.

Error codes for any faults found during the Self Test will appear along with error codes for any faults found during normal operation. The Self Test can be initiated at any time with the resulting error codes being displayed. Normal operation of the system stops when Self Test is activated. To exit Self Test and restart the system, push the COOL button.

NOTE: The in-vehicle temperature should be greater than 10°C (50°F) for all error codes shown to be valid.

If error codes appear during Self Test, refer to the Error Code Key and perform Pinpoint Tests indicated.

To exit Self Test, press COOL or turn ignition to OFF position.

If a malfunction exists but no error code appears during the Self Test, refer to Pinpoint Tests H through P. Pinpoint Tests