3-3
62-10630
Table 3-1 Alarm Indications -- Continued
ALARM
Description
CORRECTIVE ACTION
Reference
Paragraph
EE
Return Air Sensor
Return air sensor defective
Replace
bAt
Low Battery Voltage
Vehicle battery voltage low
Correct
bAt
Low Battery Voltage
Check alternator system
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Using Road & Standby opera-
tion at the same time.
If operating on road, disconnect standby power sup-
ply
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If operating on standby, shut down vehicle engine.
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Err
Setpoint above maximum.
Programming error, reset.
2.6
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Setpoint below minimum.
Programming error, reset.
2.6
Table 3-2 Mechanical Indications
INDICATION/TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
3.2 REFRIGERATION
3.2.1 Unit Will Not Cool
Compressor malfunction
Compressor drive (clutch) defective
Compressor defective
Replace
4.11
Refrigeration system
Defrost cycle has not terminated
Abnormal pressure
Hot gas solenoid malfunction (HGS1)
3.2.5
3.2.6
4.14
3.2.2 Unit Runs But Has Insufficient Cooling
Compressor
Compressor defective
4.11
Refrigeration system
Abnormal pressure
Expansion valve malfunction
No or restricted evaporator airflow
3.2.6
3.2.10
3.2.9
3.2.3 Unit Operates Long or Continuously in Cooling
Box
Hot Load
Defective box insulation or air leak
Insufficient pull
down time
Correct
Refrigeration system
Abnormal pressure
Temperature controller malfunction
3.2.6
3.2.8
Compressor
Defective
4.11
3.2.4 Unit Will Not Heat or Heating Insufficient
Refrigeration
Abnormal pressure
Temperature controller malfunction
Hot gas solenoid malfunction (HGS1)
3.2.6
3.2.8
4.14
Compressor
Compressor drive (clutch) defective
Compressor defective
Check
4.11
3.2.5 Defrost Malfunction
Automatic defrost will not initiate
Defrost thermostat (DTT) open or defective
Hot gas valve malfunction
Defrost disabled through cab command
Replace
4.14
2.7
Manual defrost will not initiate
Microprocessor defective
Defrost thermostat (DTT) open or defective
Replace
Replace
Defrost cycle initiates but does
not defrost
Hot gas solenoid malfunction (HGS1)
Condenser Pressure Control valve malfunction (HGS2)
4.14
4.14
Frequent defrost
Wet load
Defrost settings set to low.
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2.7
Does not terminate or cycles on
defrost
Defrost thermostats (DTT) shorted closed
Replace