Carrier 40 - Refrigeration System Issues; Defrost Malfunction

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 -- --
-- -- --
-- -- --
Using Road & Standby opera-
tion at the same time.
If operating on road, disconnect standby power sup-
ply
-- --
-- -- --
If operating on standby, shut down vehicle engine. -- --
Err Setpoint above maximum. Programming error, reset. 2.6
-- -- -- 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 O perates 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.
-- --
2.7
Does not terminate or cycles on
defrost
Defrost thermostats (DTT) shorted closed Replace