62-11640 7–60
P00153 CHECK RETURN AIR SENSOR
• ACTIVATION: Return Air Temperature Sensor (RAT) is not within the range of -53 to +158°F (-47 to
+70°C).
• UNIT CONTROL: Engine and Electric Operation: Pretrip will fail and display “PRETRIP FAIL AND COM-
PLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the dis-
play mounted keys or by turning the unit off, then back on again.
CORRECTIVE ACTIONS:
1. Check sensor operation
Refer to procedure for alarm 00122 CHECK RETURN AIR SENSOR. Alarm condition must be cor-
rected and the alarm cleared to continue.
P00154 CHECK SUPPLY AIR SENSOR
• ACTIVATION: Supply Air Temperature Sensor (SAT) is not within the range of -53 to +158°F (-47 to
+70°C).
• UNIT CONTROL: Engine and Electric Operation: Pretrip will fail and display “PRETRIP FAIL AND COM-
PLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the dis-
play mounted keys or by turning the unit off, then back on again.
CORRECTIVE ACTIONS:
1. Check sensor operation
Refer to procedure for alarm 00123 CHECK SUPPLY AIR SENSOR. Alarm condition must be cor-
rected and the alarm cleared to continue.
P00155 CHECK COOLANT TEMP SENSOR
• ACTIVATION: Engine Coolant Temperature Sensor (ENCT) is not within the range of -58 to +266°F (-50
to +130°C).
• UNIT CONTROL: Engine and Electric Operation: Pretrip will fail and display “PRETRIP FAIL AND COM-
PLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the dis-
play mounted keys or by turning the unit off, then back on again.
CORRECTIVE ACTIONS:
1. Check sensor operation
Refer to procedure for alarm 00129 CHECK ENG COOLANT SENSOR. Alarm condition must be
corrected and the alarm cleared to continue.