Oilless Compressors
1Youbleshooting Chart
Compressor will not run t. NO electrical power
2. Breaker open
3. Pressure switch bad
4. Check valve defective
I. Plugged in? Check fuse/breaker or motor overload
2. Reset, determine cause of problem
3. Replace
4. Remove and replace check valve
Do not dlsa_emble che_k valee
with air in tank_ bleed tank
Motor hums but cannot
run or runs slowly
1. Poor contacts, llne 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
Fuse| blow/circult
breaker trips repeatedly
I_CAUTZONI
Nevl_ uJ;e 4MI e_rlsloN
cord with thls produd
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
when compressor shuts
off
1. Loose connections (fittings, tubing,
etc.)
2. Loose drain cock
3. Check valve leaking
I. Checkall connectionswith soap and water solution
and tighten
2. Tighten
3. Disassemblecheckvalve assembly,clean or replace
Do not disassemblecheckvalve
with air in tank; bleed tank
Air output lower than I. Air leaks in piping (on machine or in 1. Replace leaking components or tighten as ne<essary
normal/low discharge outside system)
pressure 2. Piston ring broken 2. Replace
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