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Troubleshooting
16
For your own safety do not try
and run the air compressor
while troubleshooting.
!
WARNING:
TROUBLE PROBABLE CAUSE REMEDY
Compressor will not
run
Motor hums but can-
not run or runs slow-
ly
Fuses blow/circuit
breaker trips repeat-
edly
1. Unit is plugged into
extension cord
2. No electrical power
3. Blown fuse
4. Breaker open
5. Thermal overload open
6. Pressure switch bad
1. Low voltage
2. Unit is plugged into
extension cord
3. Shorted or open motor
winding
4. Defective check valve or
unloader
1. Incorrect size fuse, circuit
overloaded
2. Unit is plugged into
extension cord
3. Defective check valve or
unloader
1. Remove extension cord
2. Plugged in? Check
fuse/breaker or motor over-
load
3.Replace blown fuse
4.Reset, determining why
problem happened
5.Motor will restart when cool
6.Replace
1.Check with voltmeter
2.Remove extension cord
3.Replace motor
4.Replace or repair
1.Check for proper fuse, use
time-delay fuse.
Disconnect other electrical
appliances from circuit or
operate compressor on its
own branch circuit
2.Remove extension cord
3.Replace or repair
17
TROUBLE PROBABLE CAUSE REMEDY
Thermal overload
protector cuts out
repeatedly
Air tank pressure
drops when com-
pressor shuts off
Excessive moisture
in discharge air
Compressor runs
continuously
Compressor vibrates
Air output lower than
normal
1. Low voltage
2. Clogged air filter
3. Lack of proper ventila-
tion/room temperature
too high
4. Unit is plugged into
extension cord
1. Loose connections (fit-
tings, tubing, etc.)
2. Loose drain lock
3. Check valve leaking
1. Excessive water in air
tank
2. High humidity
1. Defective pressure
switch
2. Excessive air usage
Loose mounting bolts
1. Broken inlet valves
2. Intake filter dirty
3. Connections leaking
1.Check with voltmeter
2.Clean filter (see
Maintenance section)
3.Move compressor to well
ventilated area
4.Remove extension cord
1.Check all connections with
soap and water solution
and tighten
2.Tighten
3.Disassemble check valve
assembly, clean or replace
Do not disassemble
check valve with air in
tank; bleed tank
1.Drain tank
2.Move to area of less
humidity; use air line filter
1.Replace switch
2.Decrease air usage; com-
pressor not large enough
for a requirement
Tighten
1.Have authorized service
representative repair unit
2.Clean or replace intake fil-
ter
3.Tighten connections
!
DANGER: