Oilless Compressors
Troubleshooting Chart
Compressor will not run 1. NO electrical power
2. Breaker open
3. Pressure switch bad
4. Check valve defective
1. Plugged in? Check fuse/breaker or motor overload
2. Reset, determine cause of problem
3. Replace
4. Remove and replace check valve
DO not disassemble check valve
with air in tank; bleed tank
Motor hums but cannot
run or runs slowly
1. Poor contacts, line voltage incorrect
2. Shorted or open motor winding
3. Defective check valve or unloader
1. Check connections, check with voltmeter
2. Replace motor
3. Replace or repair
DO not disassemble check valve
with air in tank; bleed tank
Fuses blow/circuit
breaker trips repeatedly
[ACAUTION]
Never use an extension
cord with this product
1. Incorrect size fuse, circuit overloaded
2. Defective check valve or unloader
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
Tank pressure drops 1. Loose connections (fittings, tubing,
when compressor shuts etc.)
off 2. Loose drain cock
3. Check valve leaking
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
Air output lower than 1. Air leaks in piping (on machine or in 1. Replace leaking components or tighten as necessary
normaVIow discharge outside system)
pressure 2. Piston ring broken 2. Replace
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