When the air compressor shows abnormal signs during operation, immediately identify the cause of malfunction, perform a real-time troubleshooting, and continue to use the air compressor after the problem is solved. You must identify the problem, don't blindly continue to use or you may cause an unpredictable loss.

Trouble Clearing Reference Table
Trouble Appearance Possible Reason Counter Measure
Unable to start the air compressor 1. Fuse burn out
2. Electrical fault
3. Poor contact of start button
4. Poor electric connection
5. Excessively low of voltage
6. Main motor failure
7. Air end failure (abnormal sound
or parts hot)
8. Lack of power phase
9. Fan motor overload
Ask electrician to inspect and repair
High current, compressor automatic shutdown (overheating alarm from main motor) 1. Excessively low voltage
2. Excessively high discharge pressure
3. Oil-air separator block
4. Air end failure
5. Electrical fault
1. Ask electrician to check
2. Check and adjust pressure parameter
3. Replace
4. Body overhaul check
5. Ask electrician to check
Discharge air temperature lower than regular demand 1. Thermostatic valve failure
2. Long time empty-load
3. Temperature sensor failure
4. Intake valve failure, suction entrance not widely open
1. Check, clean and replace
2. Increase air consumption or stop
3. Check or replace
4. Clean and replace
High discharge air temperature, compressor automatic shutdown (alarm of high temperature) 1. Lack of lubricating oil
2. Wrong standard or type of lubricating oil
3. Oil filter block
4. Oil cooler block and serious dirty surface
5. Temperature sensor failure
6. Thermostatic valve failure
7. Too much dust on fan and cooler
8. Fan motor not working
1. Add oil
2. Replace right oil
3. Replace oil filter
4. Check and clean
5. Replace new sensor
6. Check, clean and replace
7. Clean and blowing
8. Check circuit and fan motor
Oil content is big 1. Oil-air separator damage
2. Single way oil return valve block
3. Lubricant oil excess
1 .Replace
2. Clean single way valve
3. Release some oil
Air flow is lower than normal requirement 1. Air filter block
2. Oil-air separator block
3. Electromagnetic valve leak
4. Air hose or parts leak
5. Belt slip or too loose
6. Suction valve won't completely open
1. Clean dust or replace new
2. Replace
3. Clean or replace new
4. Repair
5. Replace and tightening belt
6. Clean or replace
Spit oil from the air filter after shutdown Damage to the spring or sealing ring of the one-way valve Replace
Air blast from safety valve 1. Long time use of safety valve, spring damage
|2. Oil-air separator block
3. Pressure control failure, high working pressure
1. Replace or reset
2. Replace
3. Inspect and reset
Trouble Appearance Possible Reason Countermeasure
Unable to start the air compressor 1. Fuse burn out
2. Electrical fault
3. Poor contact of start button
4. Poor electric connection
5. Excessively low of voltage
6. Main motor failure
7. Air end failure (abnormal sound
or parts hot)
8. Lack of power phase
9. Fan motor overload
Ask electrician to inspect and repair
High current, compressor automatic shutdown (overheating alarm from main motor) 1. Excessively low voltage
2. Excessively high discharge pressure
3. Oil-air separator block
4. Air end failure
5. Electrical fault
1. Ask electrician to check
2. Check and adjust pressure parameter
3. Replace
4. Body overhaul check
5. Ask electrician to check
Discharge air temperature lower than regular demand 1. Thermostatic valve failure
2. Long time empty-load
3. Temperature sensor failure
4. Intake valve failure, suction entrance not widely open
1. Check, clean and replace
2. Increase air consumption or stop
3. Check or replace
4. Clean and replace
High discharge air temperature, compressor automatic shutdown (alarm of high temperature) 1. Lack of lubricating oil
2. Wrong standard or type of lubricating oil
3. Oil filter block
4. Oil cooler block and serious dirty surface
5. Temperature sensor failure
6. Thermostatic valve failure
7. Too much dust on fan and cooler
8. Fan motor not working
1. Add oil
2. Replace right oil
3. Replace oil filter
4. Check and clean
5. Replace new sensor
6. Check, clean and replace
7. Clean and blowing
8. Check circuit and fan motor
Oil content is big 1. Oil-air separator damage
2. Single way oil return valve block
3. Lubricant oil excess
1 .Replace
2. Clean single way valve
3. Release some oil
Air flow is lower than normal requirement 1. Air filter block
2. Oil-air separator block
3. Electromagnetic valve leak
4. Air hose or parts leak
5. Belt slip or too loose
6. Suction valve won't completely open
1. Clean dust or replace new
2. Replace
3. Clean or replace new
4. Repair
5. Replace and tightening belt
6. Clean or replace
Spit oil from the air filter after shutdown Damage to the spring or sealing ring of the one-way valve Replace
Air blast from safety valve 1. Long time use of safety valve, spring damage
2. Oil-air separator block
3. Pressure control failure, high working pressure
1. Replace or reset
2. Replace
3. Inspect and reset
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