7−78
62-11389
Alarm
NO.
Steps Alarm/Cause Corrective Action
P153 CHECK RETURN AIR SENSOR
• TRIGGER–ON: Return Air Temperature Sensor (1RAT) is not within the range of -53 to +158°F
(-47 to +70°C.)
• UNIT CONTROL: Engine and Standby 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 via
keypad or by turning the unit off, then back on again.
Check Sensor - refer to procedure for alarm 122
P154 CHECK SUPPLY AIR SENSOR
• TRIGGER–ON: Supply Air Temperature Sensor (1SAT) is not within the range of -53 to +158°F (-47
to +70°C.)
• UNIT CONTROL: Engine and Standby 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 via
keypad or by turning the unit off, then back on again.
Check Sensor - refer to procedure for alarm 123
P155 CHECK COOLANT TEMP SENSOR
• TRIGGER–ON: Engine Coolant Temperature Sensor (ENCT) is not within the range of
-58 to +266°F (-50 to +130°C.)
• UNIT CONTROL: Engine and Standby 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 via
keypad or by turning the unit off, then back on again.
Check Sensor - refer to procedure for alarm 129
P156 CHECK BATTERY VOLTS
• TRIGGER–ON: Battery voltage is less than 11 VDC or greater than 17 VDC.
• UNIT CONTROL: Engine and Standby 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 via
keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
Refer to procedure for alarm 15 for high voltage condition or procedure for alarm 16
for low voltage condition
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