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Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Compressor will
not run
1. Unit is plugged into extension cord 1. Remove extension cord
2. No electrical power, blown fuse, or tripped
circuit breaker at electrical panel
2. Replace fuse or reset breaker, determine
cause of problem
3. Motor overheated / thermal overload open 3. Unplug and allow motor to cool for
30 minutes.
4. Loose electrical connection 4. Check all electrical connections
5. ON/OFF Switch bad 5. Replace ON/OFF Switch
6. Pressure switch bad 6. Replace
7. Defective motor 7. Replace motor assembly
Motor hums but
cannot run or runs
slowly
1. Low voltage 1. Check with voltmeter
2. Unit is plugged into extension cord 2. Remove extension cord
3. Defective motor 3. Replace motor assembly
4. Defective check valve or unloader valve
(on pressure switch)
4. Replace
Fuses blow/circuit
breaker trips
repeatedly
1. Incorrect size fuse, circuit overloaded 1. Check for proper fuse, use time-
delay fuse. Disconnect other electrical
appliances from circuit or operate
compressor on its own branch circuit
2. Unit is plugged into extension cord 2. Remove extension cord
3. Defective check valve or unloader valve
(on pressure switch)
3. Replace
Thermal overload
protector cuts out
repeatedly
1. Low voltage 1. Check with voltmeter
2. Clogged air filter 2. Clean filter (see Maintenance section)
3. Lack of proper ventilation / room
temperature too high
3. Move compressor to well ventilated area
4. Unit is plugged into extension cord 4. Remove extension cord
Tank pressure
drops when
compressor shuts
off
1. Loose connections (fittings, tubing, etc.) 1. Check all connections with soap and
water solution and tighten or remove and
apply sealant to threads, then reassemble
2. Open tank drain valve 2. Close tank drain valve
Excessive moisture
in discharge air
1. Excessive water in air tanks 1. Drain tanks
2. High humidity 2. Move to area of less humidity; use air line
filter
Compressor runs
continuously
1. Defective pressure switch 1. Replace switch
2. Excessive air usage 2. Decrease air usage; compressor not large
enough for a requirement
!
WARNING:
For your own safety do not try to run the air
compressor while troubleshooting.