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TROUBLESHOOT|NG OF COMPRESSOR
Failure
Compressor
will not run
Motor hums but
caRRot run or
runs slowly
Fuses blow/
circuit breaker
trips repeatedly
Thermal
overload
}rotector cuts
out repeatedly
Air receiver
)ressure drops
when
corn pressor
shuts off
Possible Cause
1. Loss of power or
overheating
2. No electrical power
3. Blown fuse
4. Breaker open
5. Thermal overload open
6. Pressure switch bad
1. Low voltage
2. Wrong gauge wire or
length of extension cord
3. Shorted or open motor
winding
4. Defective check valve or
unloader
1. incorrect size fuse,
circuit overloaded
2. Wrong gauge wire or
length of extension cord
3. Defective check valve or
under loader
1. Low voltage
2. Clogged air filter
3. Lack of proper
ventilation/room
temperature too high
4. Wrong gauge wire or
length of extension cord
1. Loose connections
(fittings, tubing, etc.)
2. Loose drain lock
3. Check valve leaking
Solution
1. Check for proper use of extension
cord
2. Plugged in? Check fuse/breaker or
motor overload
3. Replace blown fuse
4. Reset, determining why problem
happened
5. Motor will restart when cool; turn
off compressor and wait 20 minutes
6. Replace
1. Check with voltmeter
2. Check gauge chart, under
Operation for proper gauge wire
and cord length
3. Replace motor
4. Replace or repair
1. Check for proper fuse, use time-
delay fuse. Disconnect other
electrical appliances from circuit or
operate compressor on its own
branch circuit
2. Check gauge chart, under
Operation
3. Replace or repair
1. Check with voltmeter
2. Clean filter
3. Move compressor to well ventilated
area
4. Check gauge chart, under
Operation
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. Drain receiver
Excessive 1. Excessive water in air
moisture in receiver
discharge air 2. High humidity 2. Move to area of less humidity; use
air line filter
Compressor . Defective pressure switch 1. Replace switch
runs 2. Excessive air usage 2. Decrease air usage; compressor
continuously not large enough for a requirement
3. Check valve leaking 3. Disassemble check valve assembly,
clean or replace
15 - ENG