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TROUBLESHOOTING
COMPRESSOR (see causes and solutions on next page)
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 9, 10
or rusting in cylinders
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
Motor will not start 12
Oil Leaks 41
Low Oil Pressure 42, 43, 44, 46
Excessive oil pressure fluctuations (> 5 psi) 42, 43, 44, 45, 46
ELECTRIC DRAIN TROUBLESHOOTING
Trouble Cause Action
Valve will not close. 1. Debris in solenoid 1. Remove solenoid valve,
valve prevents disassemble, clean and
diaphragm from seating. reassemble.
2. Short in electrical 2. Check and replace power
component. cord or timer as needed.
Timer will not activate. 1. No electrical supply. 1. Apply power.
2. Timer malfunction 2. Replace timer.
3. Clogged port. 3. Clean valve.
4. Solenoid valve 4. Replace solenoid
malfunction. valve.
5. Clogged strainer. 5. Clean strainer.
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