43
9. Troubleshooting
This table focuses on mechanical faults and conditions. For electrical faults that will
cause an alarm or alert message on the HMI, see the Description of Operations. For
engine trouble, refer to the CAT Operation and Maintenance Manual SEBU9106-14 or
contact your local Caterpillar dealer.
9.1. Compressor
CONDITION
POSSIBLE CAUSE
SUGGESTED REMEDY
Unit will not
start.
1. Low supply voltage.
2. Power failure.
3. Programmable controller problem.
4. Compressor in alarm.
5. Compressor in Remote Mode.
6. Compressor in Standby
1. Check fuses or circuit breaker.
2. Check for proper voltage and connections.
3. Check PLC for proper operation.
4. Reset alarm condition.
5. Check that remote control is enabled and a
remote run signal is present.
6. Check pressure settings or manual unload
selection.
Compressor
shuts down on
high cabinet
temperature.
1. High ambient temp.
2. Dirty coolers.
3. Obstructed cooling air flow.
4. Air leaking from bleed-off silencer when
loaded.
1. Maximum 104
°
F (40
°
C).
2. Clean coolers (see section 6.4).
3. Check for and remove any foreign material
blocking air flow.
4. Rebuild CCV.
High inlet air
temperature.
1. High ambient temp.
1. Maximum 104
°
F (40
°
C). Check for
recycled cooling air; consider using
external inlet air source.
High 1st stage
discharge air
temperature.
1. Inlet filter plugged.
2. High ambient temp.
3. 2nd stage worn or damaged.
4. Balance valve open (if provided)
1. Change filter elements.
2. See High Inlet Air Temperature.
3. Replace 2nd stage air end.
4. Adjust balance valve.
High 2nd stage
suction air
temperature.
1. Dirty intercooler core.
2. Obstructed cooling air flow.
3. High ambient temperature.
1. Clean intercooler (see section 6.4).
2. Check for and remove any foreign material
blocking air flow.
3. See High Inlet Air Temperature.
High 2nd stage
discharge air
temperature.
1. High second stage discharge pressure.
2. Dirty intercooler core.
3. 1st stage damaged.
4. Defective discharge check valve.
1. Lower operating pressure to normal.
2. Clean intercooler (see section 6.4).
3. Replace 1st stage air end.
4. Repair or replace check valve.
