Heating And Air Conditioning

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow


OVERALL SEQUENCE







DETAILED FLOW


1. INTERVIEW FOR MALFUNCTION

Interview the symptom to the customer.
- GO TO 2.

2. SYMPTOM CHECK

Check the symptom from the customer's information. Check that any symptom occurs other than the interviewed symptom.
Insufficient cooling/heating-GO TO 3.
Refrigerant leakage-GO TO 6.
Noise- GO TO 7.

3. CONTROL SYSTEM DIAGNOSIS

Perform the system diagnosis for the A/C control system. Automatic Air Conditioning.
Is A/C control system normal?
YES- GO TO 4.
NO- GO TO 8.

4. PERFORMANCE TEST

Perform the performance test. Check the operation of each part. Performance Test.
- GO TO 5.

5. TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE

Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify the malfunctioning part. Symptom Table.
Low refrigerant charge-GO TO 6.
Except above-GO TO 8.

6. CHECK REFRIGERANT FOR LEAKAGES

Check refrigerant for leakages. Specify the malfunctioning part. Leak Test.
- GO TO 8.

7. TROUBLE DIAGNOSIS FOR NOISE

Perform trouble diagnosis for noise. Specify the malfunctioning part. Noise.
- GO TO 8.

8. MALFUNCTION PART REPAIR

Repair or replace the malfunctioning part.
- GO TO 9.

9. REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.
Does it operate normally?
YES- INSPECTION END
NO- GO TO 2.