CT1001
www.chpower.com
7
Troubleshooting Chart
SYMPTOM
CAUSE
SOLUTION
Compressor will
not run
1� No electrical power
1� Plugged in? Check fuse/breaker or motor overload
2� Blown fuse
2� Replace blown fuse
3� Breaker open
3� Reset, determine cause of problem
4� Thermal overload tripped
4� Reset Thermal overload
5� Pressure switch bad
5� Replace
6� Check valve defective
6� Remove and replace check valve *
Motor hums but
cannot run or
runs slowly
1� Poor contacts, line voltage incorrect
1� Check connections, check with voltmeter
2� Shorted or open motor winding
2� Replace motor
3� Defective check valve or unloader
3� Replace or repair *
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� Defective check valve or unloader
2� Replace or repair *
Thermal overload
protector cuts out
repeatedly
1� Low voltage
1� Check with voltmete
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� Check valve malfunction
4� Replace *
Knocks, rattles,
excessive
vibration
1� Leaking, broken, or loose valves or
restricted air passage
1� Replace
2� Defective pressure switch unloader
2� Replace or repair as necessary
3� Defective bearing on eccentric or motor
shaft
3� Replace
4� Cylinder or piston ring is worn or scored 4� Replace or repair as necessary
5� Loose bolts, tank not level
5� Tighten bolts, shim tank to level position
Tank pressure
drops when
compressor shuts
off
1� Loose connections (fittings, tubing, etc�) 1� Check all connections with soap and water solution and
tighten
2� Loose drain valve
2� Tighten
3� Check valve leaking
3� Disassemble check valve assembly, clean or replace *
Air output lower
than normal/
low discharge
pressure
1� Clogged intake port
1� Clean or replace
2� Air leaks in piping (on machine or in
outside system)
2� Replace leaking components or tighten as necessary
3� Broken inlet valves
3� Have authorized service representative repair unit
4� Piston ring broken
4� Replace
5� Cylinder or piston ring is worn or scored 5� Replace
Excessive
moisture in
discharge air
1� Excessive water in tank
1� Drain tank
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 air
requirement
Excessive starting
and stopping
(auto start)
1� Excessive condensation in tank
1� Drain more often
2� Air leaks in piping (on machine or in
outside system)
2� Replace leaking components or tighten as necessary
3� Tank check valve leaking
3� Replace or repair as necessary *
Air leaking from
unloader on
pressure switch
Check valve stuck in an open position
Remove and replace check valve *
*
Do not disassemble check valve with air in tank; bleed the tank.