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WL6000 Series
5
Operating Instructions
Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
1. No electrical power
2. Blown fuse
3. Breaker open
4. Thermal overload open
5. Pressure switch bad
6. Check valve defective
1. Poor contacts, line voltage incorrect
2. Shorted or open motor winding
3. Defective check valve or unloader
1. Incorrect size fuse, circuit overloaded
2. Defective check valve or unloader
1. Low voltage
2. Clogged air filter
3. Lack of proper ventilation/room temperature
too high
4. Check valve malfunction
1. Leaking, broken, or loose valves or restricted air
passage
2. Defective pressure switch unloader
3. Defective bearing on eccentric or motor shaft
4. Cylinder or piston ring is worn or scored
5. Loose bolts, tank not level
1. Loose connections (fittings, tubing, etc.)
2. Loose drain cock
3. Check valve leaking
1. Clogged intake filter
2. Air leaks in piping (on machine or in outside
system)
3. Broken inlet valves
4. Piston ring broken
5. Cylinder or piston ring is worn or scored
1. Excessive water in tank
2. High humidity
1. Defective pressure switch
2. Excessive air usage
1. Excessive condensation in tank
2. Air leaks in piping (on machine or in outside
system)
3. Tank check valve leaking
Check valve stuck in an open position
1. Plugged in? Check fuse/breaker or motor overload.
2. Replace blown fuse
3. Reset, determine cause of problem
4. Motor will restart when cool
5. Replace
6. Remove and replace check valve
Do not disassemble check valve
with air in tank; bleed tank
1. Check connections, check with voltmeter
2. Replace motor
3. Replace or repair
Do not disassemble check valve
with air in tank; bleed tank
1. Check for proper fuse, use time-delay fuse. Disconnect other
electrical appliances from circuit or operate compressor on its own
branch circuit.
2. Replace or repair
Do not disassemble check valve
with air in tank; bleed tank
1. Check with voltmeter
2. Clean filter (see Maintenance section)
3. Move compressor to well ventilated area
4. Replace
Do not disassemble check valve
with air in tank; bleed tank
1. Replace
2. Replace or repair as necessary
3. Replace
4. Replace or repair as necessary
5. Tighten bolts, shim tank to level position
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. Clean or replace
2. Replace leaking components or tighten as necessary
3. Have authorized service representative repair unit
4. Replace
5. Replace
1. Drain tank
2. Move to area of less humidity; use air line filter
1. Replace switch
2. Decrease air usage; compressor not large enough for air requirement
1. Drain more often
2. Replace leaking components or tighten as necessary
3. Replace or repair as necessary
Do not disassemble check valve
with air in tank; bleed tank
Remove and replace check valve
Do not disassemble check valve
with air in tank; bleed tank
Compressor will not run
Motor hums but cannot run or
runs slowly
Fuses blow/circuit breaker trips
repeatedly
Never use an extension
cord with this product
Thermal overload protector
cuts out repeatedly
Knocks, rattles, excessive
vibration
Tank pressure drops when
compressor shuts off
Air output lower than
normal/low discharge pressure
Excessive moisture in discharge
air
Compressor runs continuously
Excessive starting and
stopping (auto start)
Air leaking from unloader on
pressure switch