FAULT FINDING
25
M4 M5,5 M7,5 M11
FAULT CAUSE
Compressor fails to start Control voltage not available.
Defective starter.
Machine shutsdown periodically Defective starter.
Motor overload.
Line voltage variation.
High current draw Compressor operating above rated pressure.
Separator filter element contaminated.
Low voltage.
Unbalanced voltage.
Low current draw Air filter contaminated.
Compressor operating unloaded.
High voltage.
High discharge pressure Incorrect pressure switch setting.
Load solenoid valve defective.
Blowdown valve defective.
Inlet valve malfunction.
Low system air pressure Separator filter element contaminated.
Incorrect pressure switch setting.
Minimum pressure valve malfunction.
Load solenoid valve defective.
Drive belt slipping.
Air system leaks.
Inlet valve malfunction.
System demand exceeds compressor delivery.
Low coolant level.
Compressor overheats Compressor operating above rated pressure.
Cooler blocked.
Low coolant level.
High ambient temperature.
Restricted cooling air flow.
Excessive coolant consumption Separator element leak.
Blocked separator element drain.
Compressor operating below rated pressure.
Coolant system leak.
Excessive noise level Air system leaks.
Airend defective.
Motor defective.
Loose components.
Shaft seal leaking Defective shaft seal.
Pressure relief valve opens Compressor operating above rated pressure.
Incorrect pressure switch setting.
Minimum pressure valve malfunction.
Load solenoid valve defective.
Blowdown valve defective.
Inlet valve malfunction.
Black residue on belt guard/cooler box Drive belt slipping.
Pulleys misaligned.
Worn pulleys.
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