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Problem
Possible Cause
Compressor
1. Air leaks in shop
does not build
2. Inlet valve malfunction
up to
3. Compressor belts slipping
pressure
4. Air demand exceeds
compressor output
5. Pressure switch set to low
6. Solenoid valve malfunction
7. Compressor rotors damaged
Compressor will
1. Pressure switch set to high
not load to
2. Inlet valve malfunction
compress air
3. Faulty solenoid
CFM Flow (air
1. Restricted air intake filter
flow) seems low
2. Inlet valve partially closed
3. Air pressure set to high
4. Insufficient oil flow
5. Solenoid valve malfunction
Excessive oil
1. Over filled sump
consumption
2. Broken oil line
3. Plugged oil return line
4. Damaged or dirty separator
5. Excessive unloaded compressor
run time
High tempera-
1. High ambient air temperature
ture shutdown
around compressor
2. Low oil level in compressor
3. Plugged oil filter
4. Restricted air flow over cooler
5. Thermal by pass leaking
6. Faulty temperature switch
30
troubleshooting
Solutions
1. Find and fix shop air leaks
2. Check inlet valve for proper
function
3. Check air usage requirements
on machinery and check for
shop air leaks
4. Check pressure switch for
proper setting
5. Check solenoid for proper
function
1. Check pressure switch for
proper setting
2. Check inlet valve for proper
function
3. Check solenoid for proper
function
1. Check sump for proper oil level
2. Check all lines for cracks
3. Replace separator
4. Add a timer to the system
1. Lower ambient temperature
around compressor
2. Check unit for proper oil level
3. Replace oil filter
4. Clean oil cooler
5. Check thermal bypass for
proper operation
6. Check temperature switch for
proper operation.
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