62-11637 9–6
Indication/Trouble Possible Causes Action / Reference
9.3.9 Abnormal Pressure Cooling
High discharge pressure
Condenser coil dirty 8.9.2
Condenser fan/upper belt defective 8.6.3
Discharge check valve restricted 8.9.10
Refrigerant overcharge or noncondensibles 8.7.2
Discharge service valve partially closed Open
Low discharge pressure
SV4 leaking 8.9.6
Compressor valve(s) worn or broken 8.8.1
Low refrigerant charge 8.7.2
Suction modulation valve malfunction 8.9.8
Low suction pressure
Filter-drier partially plugged 8.9.3
Low refrigerant charge 8.7.2
Expansion valve malfunction 9.3.13
No evaporator air flow or restricted air flow 9.3.12
Excessive frost on evaporator coil 9.3.8
SV2 defective 8.9.6
Suction modulation valve malfunction 8.9.8
Liquid or suction line service valve partially closed Open
Clutch failure 8.6.4
High suction pressure
SV4 leaking 8.9.6
Compressor valves(s) worn or broken 8.8.1
Compressor gasket(s) defective 8.8.1
Suction and discharge pressures
tend to equalize when unit is oper-
ating
Compressor valves defective 8.8.1
Compressor gasket(s) defective 8.8.1
9.3.10 Abnormal Pressure Heating
High discharge pressure
Solenoid valve malfunction 8.9.5 / 8.9.6
Condenser fan/upper belt defective 8.6.3
Check system for noncondensibles 8.7.2
Low discharge pressure
Compressor valves defective 8.8.1
SV1 leaking 8.9.5
Low refrigerant charge 8.7.2
Low suction pressure
Low refrigerant charge 8.7.2
SV1 leaking 8.9.5
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