10HP - 20HP Scroll Enclosure Air Compressors
Pg 2
TROUBLESHOOTING GUIDE
Problem
Possible Cause
Corrective Action
Comp
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No Display on the
Operating Panel
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. Turn on electric source
2. Replace
3. Connect correctly
4. Inspect, repair or replace
It does not operate
despite displays
1. Failure or wiring failure of magnetic starter
2. Motor failure
3. Low voltage
1. Inspect, repair or replace
2. Inspect, repair or replace
3. Check electric source capacity and the size of
electric source cable and change to proper one
Alarm Screen
Active
1. High temperature condition
2. Motor Overload condition
3. High temperature indicated but unit is cool,
has never been hot
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
Compressor starts but then st
ops
Alarm Screen
High Temperature
1. High ambient temperature or bad ventilation
2. Clogging of aftercooler fins or intake wire
screen
3. Failure of ventilating fan
4. Damage to intake hose
5. Cooling passage of air end clogged
6. High exhaust pressure
1.Improve installation environment & ventilation
2. Clean
3. Replace
4. Replace
5. Inspect and clean
6. Inspect– control malfunction likely
Alarm Screen
Motor Overload
1. Low voltage
2. Motor Failure
3. Air end failure
4. Loosened wiring screw
5. High exhaust pressure
6. Failure of thermal overload
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
Exhaust pressure
does not increase
1. Air leaks from exhaust piping
2. Air-end rotates backward
3. Wrong pressure setting
4. Clogged intake filter
1. Inspect, repair
2. Change phases
3. Readjust
4. Clean or replace
Safety valve
activates
1. Failure of safety valve
2. Failure of pressure setting
1. Replace
2. Inspect - control failure likely
Abnormal sound
1. Air-end rotates backward
2. Air end failure
3. Belt slips
4. Motor failure
5. Cooling fan contacting frame
6. Loosened bolts
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
