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Problem
Compressor will not run
Motor hums but cannot run or runs
slowly
Fuses blow/circuit breaker trips
repeatedly
Thermal overload protector cuts out
repeatedly
Air receiver pressure drops when
compressors shuts off
Excessive moisture in discharge air Excessive water in air tank.
Air leaking
Compressor runs continuously
Compressor vibrates
Air output lower than normal
TROUBLESHOOTING
Possible Cause
Tank has sufficient pressure.
No electrical power.
Blown stop/house fuse.
Tripped shop/home breaker.
Thermal overload open.
Loss of power or overheating.
Pressure switch is bad.
Low voltage.
Wrong gauge wire or length of
extension cord.
Shorted or open motor winding.
Defective check valve or unloader.
Incorrect size fuse, circuit overload.
Wrong gauge wire or length of
extension cord.
Defective check valve or unloader.
Low voltage.
Lack of proper ventilation/room
temperature too high.
Wrong gauge wire or length of
extension cord.
Loose connections (fittings, tubing,
etc.).
Loose drain valve.
Check valve leaking.
High humidity.
Loose or improperly sealed hose
connection.
Broken or damaged air hose.
Tank drain valve or inflation valve
open.
Defective pressure switch.
Excessive usage.
Loose mounting bolts.
Broken inlet valves.
Connections leaking.
18
Solution
Compressor will turn on when tank
pressure drops to cut-in pressure.
Check to be sure unit is plugged in.
Replace shop/house fuse.
Reset shop/home breaker, determine why
problem happened.
First unplugged the compressor and
wait until it becomes cool. After that
compressor can be used.
Check for proper use of extension cord.
Replace pressure switch.
Check with voltmeter.
Check for proper gauge wire and cord
length.
Take compressor to service center.
Take compressor to service center.
Check for proper fuse, use time-
delay fuse, disconnect other electrical
appliances from circuit or operate
compressor on its own branch circuit.
Check for proper gauge wire and cord
length.
Take compressor to service center.
Check with voltmeter.
Move compressor to well-ventilated area.
Check for proper gauge wire and cord
length.
Check all connections with soap and
water solution and tighten.
Tighten drain valve.
Take compressor to service center.
WARNING:
Do not disassemble check valve with air
in tank - bleed tank.
Drain tank.
Move to area of less humidity; use air line
filter.
Ensure connections are sealed with
thread sealing tape and tightened.
Replace air hose.
Ensure tank drain valve and inflation
valves are closed.
Take compressor to service center.
Decrease air usage; compressor not large
enough for tool's requirement.
Tighten mounting bolts.
Take compressor to service center.
Apply thread sealing tape to fitting and
tighten.
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