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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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