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. Check all connectionswith soap and water solution
and tighten
2. Tighten
3. Disassemblecheck valve 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
_.d_pewer.com