Diagnostic Starting Point - Heating, Ventilation and Air Conditioning

Diagnostic Starting Point - Heating, Ventilation and Air Conditioning

The Heating, Ventilation and Air Conditioning (HVAC) system is divided into three sections. The first, Heating, Ventilation and Air Conditioning, has all procedures that pertain to a HVAC component or function that are not specifically associated with an automatic or manual control system. The second, HVAC Systems-Manual, has all procedures specific to the manual control system. The third, HVAC Systems-Automatic, has all the procedures specific to the automatic control system.

For systems without DTCs, refer to Symptoms - HVAC Systems - Manual Symptoms - HVAC Systems - Manual in order to identify the correct procedure for diagnosing the system and where the procedure is located.

For systems with DTCs, refer to Diagnostic System Check - HVAC Systems - Automatic HVAC - Automatic in order to identify and lead the technician to the correct diagnostic procedure.

Review the Description and Operation information to help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Air Delivery Description and Operation HVAC - Manual.