TROUBLESHOOTING GUIDE — Refrigerant-pressure diagnostic cases (1–7)
U-13spec tableRefrigerant-pressure cases
Case 1
Measured pressureLow side: Below 78.5 kPa (0.8 kg/cm², 11.4 psi); High side: 785—883 kPa (8—9 kg/cm², 114—128 psi)
Possible causeInsufficient refrigerant
ActionRefer to page U-14
Case 2
Measured pressureLow side: Above 245 kPa (2.5 kg/cm², 35.6 psi); High side: Above 1,962 kPa (20 kg/cm², 284 psi)
Possible causeExcessive refrigerant or insufficient condenser cooling
ActionRefer to page U-15
Case 3
Measured pressureLow side: Above 245 kPa (2.5 kg/cm², 35.6 psi); High side: Above 2,256 kPa (23 kg/cm², 327 psi)
Possible causeAir in system
ActionRefer to page U-15
Case 4
Measured pressureLow side: 50 cmHg (2.0 inHg) of Vacuum—147 kPa (1.5 kg/cm², 21.3 psi); High side: 687—1,472 kPa (7—15 kg/cm², 100—213 psi)
Possible causeMoisture in system
ActionRefer to page U-16
Case 5
Measured pressureLow side: 76 cmHg (3.0 inHg) of Vacuum; High side: Below 589 kPa (6 kg/cm², 85 psi)
Possible causeNo refrigerant circulation
ActionRefer to page U-16
Case 6
Measured pressureLow side: Above 245 kPa (2.5 kg/cm², 35.6 psi); High side: 1,864—1,962 kPa (19—20 kg/cm², 270—284 psi)
Possible causeExpansion valve stuck open
ActionRefer to page U-17
Case 7
Measured pressureLow side: 392—589 kPa (4—6 kg/cm², 57—85 psi); High side: 687—981 kPa (7—10 kg/cm², 100—142 psi)
Possible causeFaulty compressor
ActionRefer to page U-17