Carrier NEOS 100S - Refrigeration; Unit will Not Cool; Unit Runs but Has Insufficient Cooling; Table 6-2 Mechanical Indications

62-11848 6-2
A07
Evaporator Fan Motor (EFM)
high amp draw
Verify motor rotates freely / no obstructions --
Replace motor --
A09
Defrost Valve (HGV) high amp
draw
Current draw of coil high or low (approx. 1.33
amp)
Replace coil 5.10.1
A11
Main Heat Valve (HGS2) high
amp draw
Current draw of coil high or low (approx. 1.6
amp)
Replace coil 5.10.1
A12 High temperature alarm
Box temperature is higher than setpoint for 15
minutes.
A13 Low temperature alarm
Box temperature is lower than setpoint for 15
minutes.
A14 Defrost time > 45 minutes
Unit has been in defrost for more than 45
minutes.
Verify defrost cycle operation
A15
Setpoint adjusted out of the
range -20.2 to 86°F (-29°C to
+30°C).
Check setpoint value entered. 3.5
EE
Evaporator Temperature Sen-
sor Failure
Return air sensor is defective. Replace
bAt Low Battery Voltage
Vehicle battery voltage low Correct
Check alternator system --
SE Maintenance needed. Perform unit basic maintenance
Table 6–2 Mechanical Indications
INDICATION / TROUBLE POSSIBLE CAUSES
REFERENCE
SECTION
6.2 REFRIGERATION
6.2.1 Unit Will Not Cool
Compressor malfunction
Compressor drive (clutch) defective
Replace
Compressor defective
Refrigeration system
Defrost cycle has not terminated 6.2.5
Abnormal pressure 6.2.6
Hot gas solenoid malfunction 5.10
6.2.2 Unit Runs But Has Insufficient Cooling
Compressor Compressor defective Replace
Refrigeration system
Abnormal pressure 6.2.6
Expansion valve malfunction 6.2.10
Non-existent or restricted evaporator airflow 6.2.9
Table 6–1 Alarm Indications
ALARM Description CORRECTIVE ACTION
Reference
Section