62-12259 7–64
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
COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the
display mounted keys or by turning the unit off, then back on again.
Corrective Actions:
Check sensor operation - Refer to procedure for alarm 00122 Check Return Air Sensor. Alarm con-
dition must be corrected 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
COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the
display mounted keys or by turning the unit off, then back on again.
Corrective Actions:
Check sensor operation - Refer to procedure for alarm 00123 Check Supply Air Sensor. Alarm con-
dition must be corrected and the alarm cleared to continue.
P00155 Check Coolant Temperature 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
COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset using the
display mounted keys or by turning the unit off, then back on again.
Corrective Actions:
Check sensor operation - Refer to procedure for alarm 00129 Check Engine Coolant Sensor. Alarm
condition must be corrected and the alarm cleared to continue.
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