Symptoms:                                                   Possible Causes:

High Discharge Temperature

Low Oil Level
Dirty heat exchanger
Faulty thermal bypass valve
Plugged oil filter
Plugged air/oil separator
Obstruction in oil system

Excessive Lubricant Consumption

Clogged separator scavenger line
Incorrectly adjusted scavenger line
Oil sump overfilled
Oil foaming in sump

Premature Lubricant Breakdown

Compressor temperature too hot
Ingestion of foreign substance through intake
Excessive condensate in system
Mixed oil types
Incorrect oil additives

Increased Amp Draw

Plugged air/oil separator
Airend bearings starting to fail
Obstruction in air lines
Obstruction in oil lines
Dirty or spent lubricant

Decreased Discharge Pressure

Faulty inlet valve
Plugged air/oil separator
Plugged intake filter
Excessive leaks in plant piping

Air/Oil Separator Collapse

Minimum pressure valve sticking
Dirty or spent lubricant
Faulty check valve
Ingestion of foreign substance through intake

Compressor Shutting Down

High temperature
High discharge pressure
Low oil pressure
Blown fuse
Power failure