T-368
4–36
AL54
PRIMARY SUPPLY SENSOR (STS)
Cause:
Invalid Supply Temperature Sensor (STS) reading.
Component
Supply Temperature Sensor (STS)
Troubleshooting
Perform Pre-trip P5:
Corrective Action
If P5 passes, no further action is required.
If P5 fails, replace the defective sensor as determined by P5, refer to TEM-
PERATURE SENSOR Service
.
AL56
PRIMARY RETURN SENSOR (RTS)
Cause:
Invalid Return Temperature Sensor (RTS) reading.
Component
Return Temperature Sensor (RTS)
Troubleshooting
Perform Pre-trip P5:
Corrective Action
If P5 passes, no further action is required.
If P5 fails, replace the defective sensor as determined by P5, refer to TEM-
PERATURE SENSOR Service
.
AL57
AMBIENT SENSOR (AMBS)
Cause:
Invalid Ambient Temperature Sensor (AMBS) reading.
Component
Ambient Temperature Sensor (AMBS)
Troubleshooting
Test the AMBS, refer to TEMPERATURE SENSOR Service
Corrective Action
Replace AMBS if defective, refer to TEMPERATURE SENSOR Service
AL58
COMPRESSOR HIGH PRESSURE SAFETY (HPS)
Cause:
High pressure safety switch remains open for at least one minute.
Component
High Pressure Switch (HPS)
Troubleshooting
Test the HPS; refer to High Pressure Switch,
.
Corrective Action
Replace HPS if defective, refer to High Pressure Switch,
Component
Refrigeration System
Troubleshooting
Check unit for air flow restrictions.
Corrective Action
Clean or remove any debris from coils.
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