Product Manual

13
2 HP - 5 HP Scroll Enclosure Air Compressors
Troubleshooting Guide
PROBLEM CAUSE CORRECTIVE ACTION
Power ON light does not
appear
1. Main disconnect is not ON
2. Blown fuse or circuit breaker at
customer provided power supply
3. Blown fuse at transformer
4. Lighted switch is burned out
1. Switch disconnect to ON
2. Inspect for any fault replace fuse or trip
disconnect to ON
3. Replace fuse - be sure to use same type and
size
4. Replace lighted switch
Power ON light is on but unit
will not start
1. Motor overload has tripped
2. Wrong or low voltage
3. Starter has failed
4. Motor has failed
1. See last entry of Troubleshooting Guide
2. Check incoming power supply and unit power
rating
3. Replace contactor assembly
4. Replace motor
Compressor is running but will
not make pressure
1. Drive belts came off or too loose
2. Clogged intake fi lter element
3. Pressure relief valve has opened
4. Excessive tip seal wear
5. Electric tank drain is open continuously
6. Unit running in the wrong direction
7. Discharge air is leaking
1. Replace drive belts and (or) tighten
2. Replace intake fi lter element
3. Pressure switch needs replaced or motor
contacts welded shut
4. Replace tip seals
5. Replace tank drain
6. Correct power connections
7. Check discharge piping
Excessive noise or vibration 1. Drive belt has separated or fl at spot
2. Motor has failed
3. Pump is damaged
4. Cooling air fan is touching fan guard
1. Replace drive belt
2. Replace motor
3. Fix or replace pump
4. Check air fan daily
Compressor shuts down on
high temperature
1. Room temperature is above 104° F
2. Inlet air duct is obstructed
3. Cooling air fan not running
4. Aftercooler fi ns clogged
5. Intake fi lter damaged
6. Compressor is dirty
7. Tip seals worn
1. Add ventilation or air conditioning to room
2. Remove obstruction or reposition unit to allow
for cooling air
3. Replace cooling air fan
4. Clean aftercooler
5. Check intake fi lter
6. Clean unit
7. Replace tip seals
Compressor turns on / off
rapidly
1. Receiver tank has high level of water
2. Compressor check valve has failed
3. Defective pressure switch
1. Replace electric tank drain / drain tank
2. Replace check valve
3. Replace pressure switch
Safety valves blows off 1. Pressure switch has failed to open
2. Motor starter contacts welded shut
1. Replace pressure switch
2. Replace motor starter
Motor Overload has tripped 1. Pump has failed
2. Motor has failed
3. Improper wiring
4. Wrong overload setting
5. Low voltage
1. Fix or replace pump
2. Replace motor
3. Check wiring
4. Check overload setting
5. Check incoming power supply