11
TROUBLESHOOTING
PROBLEM
CHECK POINT
Abnormal piston, ring or cylinder wear
4, 8, 9, 19, 28, 35
Air delivery drops off
1, 6, 15, 16, 18, 19, 29
Automatic drain valve leaks or does not drain automatically
16
Auxiliary valve chatters or leaks around stem
23, 24
Broken intercooler or aftercooler tubes
36
Compressor does not come up to speed
2, 6, 12, 15, 21
Compressor is slow to come up to speed
26, 27, 33, 34
Compressor runs excessively hot
3, 14, 15, 22
Compressor will not unload cycle
23, 24, 26
Compressor will not unload when stopped
26, 33
Excessive noise during operation
2, 6, 15, 16, 21, 27, 32
Excessive starting and stopping
5, 11, 16, 32, 40
Knocks or rattles
2, 15, 17, 19, 20, 21
Lights flicker or dim when running
12, 13
Moisture in crankcase or “milky” appearance in petroleum lubricant or
rusting in cylinders
9, 10
Motor overload trips or draws excessive current
5, 6, 12, 13, 14, 15, 16, 19, 20, 21, 34
Oil in discharge air (oil pumping)
4, 7, 9, 18, 19, 25, 35
Oil leaking from shaft seal
25
Safety/relief valve “pops”
1, 5, 29, 30
High interstage pressure
30
Low interstage pressure
31
Engine cranks slowly or will not start
6, 14, 37, 38
Motor will not start
12
Engine will not start
39
Oil Leaks
41
ELECTRIC DRAIN TROUBLESHOOTING
Trouble
Cause
Action
Valve will not close.
1. Debris in solenoid valve
prevents diaphragm from
seating.
2. Short in electrical component.
1. Remove solenoid valve,
disassemble, clean and
reassemble.
2. Check and replace power cord
or timer as needed.
Timer will not activate.
1. No electrical supply.
2. Timer malfunction
3. Clogged port.
4. Solenoid valve malfunction.
5. Clogged strainer.
1. Apply power.
2. Replace timer.
3. Clean valve.
4. Replace solenoid valve.
5. Clean strainer.
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