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Troubleshooting Guide
Problem
No Display on the Operating
Panel
It does not operate despite
displays
Alarm Screen Active
Alarm Screen High
Temperature
Alarm Screen Motor
Overload
Exhaust pressure does not
increase
Pressure relief valve
activated
Abnormal sound
RELEASED 01/Jul/2024 12:28:06 GMT
7.5-15 kW (10-20 HP) Scroll Enclosed Air Compressors
Possible Cause
1. The electric source is not turned on
2. Transformer primary or secondary fuse open
3. Electric source is not correctly connected
4. Failure of display or PLC
1. Failure or wiring failure of magnetic starter
2. Circuit board failure
3. Motor failure
4. Low voltage
1. High temperature condition
2. Motor Overload condition
3. High temperature indicated but unit is cool, has
never been hot
1. Motor has failed
2. Pump is damaged
3. Cooling air fan is touching fan guard
1. Low voltage
2. Motor Failure
3. Air end failure
4. Loosened wiring screw
5. High exhaust pressure
6. Failure of thermal overload
1. Air leaks from exhaust piping
2. Air-end rotates backward
3. Wrong pressure setting
4. Clogged intake filter
1. Failure of pressure relief valve
2. Failure of pressure setting
1. Air-end rotates backward
2. Air end failure
3. Belt slips
4. Motor failure
5. Cooling fan contacting frame
6. Loosened bolts
Corrective Action
1. Turn on electric source
2. Replace
3. Connect correctly
4. Inspect, repair or replace
1. Inspect, repair or replace
2. Inspect, repair or replace
3. Inspect, repair or replace
4. Check electric source capacity and the size of
electric source cable and change to proper one.
1. Allow to cool and reset, determine cause
2. Reset motor overload, reset alarm and determine
root cause of overload
3. A temperature switch may be disconnected or
defective, check wiring
1. Replace motor
2. Fix or replace pump
3. Check air fan daily
1. Check electric source capacity, size of electric
source cable and change to proper one
2. Inspect, repair or replace
3. Inspect, repair or replace
4. Tighten
5. Inspect - control failure likely
6. Replace
1. Inspect, repair
2. Change phases
3. Readjust
4. Clean or replace
1. Replace
2. Inspect - control failure likely
1. Change phases
2. Inspect, repair or replace
3. Check tension and readjust
4. Inspect, repair or replace
5. Inspect and repair
6. Inspect and tighten
47672197001 • 04/17/24 • Rev. F
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