Heater and Air Conditioner
Section U — 42 pages
TROUBLESHOOTING GUIDE
U-4 — U-17- U-4CIRCUIT DIAGRAM
- U-5Connector pinouts
- U-6Symptom index / Electrical Troubleshooting Tools / General Precaution
- U-7Blower motor does not operate
- U-8Blower motor (Steps 3–5)
- U-9Symptom: Magnetic clutch does not operate.
- U-10Magnetic clutch troubleshooting (Steps 4–7)
- U-11Symptom: Additional (condenser) fan does not operate.
- U-12Symptoms: Insufficient cooling / No cooling / Intermittent cooling.
- U-13Refrigerant-pressure diagnostic cases (1–7)
- U-14Case 1: Insufficient refrigerant
- U-15Case 2 (Excessive refrigerant) and Case 3 (Air in system)
- U-16Case 4 (Moisture in system) and Case 5 (No refrigerant circulation)
- U-17Case 6 (Expansion valve stuck open) and Case 7 (Faulty compressor)
HEATER
U-18 — U-25AIR CONDITIONER
U-26 — U-43- U-26AIR CONDITIONER
- U-27AIR CONDITIONER
- U-28AIR CONDITIONER
- U-29AIR CONDITIONER
- U-30AIR CONDITIONER
- U-31AIR CONDITIONER
- U-32AIR CONDITIONER
- U-33AIR CONDITIONER
- U-34AIR CONDITIONER
- U-35AIR CONDITIONER
- U-36AIR CONDITIONER
- U-37AIR CONDITIONER
- U-38AIR CONDITIONER
- U-39AIR CONDITIONER
- U-40AIR CONDITIONER
- U-41AIR CONDITIONER
- U-42AIR CONDITIONER
- U-43AIR CONDITIONER