HVAC SYSTEM (HEATER, VENTILATOR AND A/C) > Refrigerant Pressure with Manifold Gauge Set
|
Symptom |
Probable cause |
Repair order |
|
High-pressure side is unusually high. |
• Defective condenser fan motor • Clogged condenser fin • Too much refrigerant • Air inside the system • Defective receiver dryer |
• Replace the fan motor. • Clean the condenser fin. • Discharge refrigerant. • Replace the receiver dryer. • After evacuating again, charge an appropriate amount of refrigerant. |
|
High-pressure side is unusually low. |
• Defective compressor • Not enough refrigerant • Clogged expansion valve • Expansion valve frozen temporarily by moisture. |
• Replace the compressor. • Check for leaks. • Replace the expansion valve. • Fully evacuate the expansion valve. |
|
Low-pressure side is unusually high. |
• Defective compressor • Defective expansion valve • Too much refrigerant |
• Replace the compressor. • Replace the expansion valve. • Discharge refrigerant. |
|
Low-pressure side is unusually low. |
• Not enough refrigerant • Clogged expansion valve • Expansion valve frozen temporarily by moisture. • Saturated receiver dryer |
• Check for leaks. • Replace the expansion valve. • Replace the receiver dryer. |