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Troubleshooting Chart
Symptom
Possible Cause(s)
Compressor will
1. No electrical power
not run
2. Breaker open
3. Pressure switch bad
4. Motor over worked
5. Tank pressure above cut-in
Fuses blow / circuit
1. Incorrect size fuse, circuit
breaker trips
overloaded
repeatedly
2. Extension cord usage - wrong
gauge wire and/or too long.
3. Worn check valve
4. Defective unloader valve (on
pressure switch)
5. Defective motor capacitor(s)
6. Defective motor
Tank pressure drops
1. Loose connections (fittings,
when compressor
tubing, etc.)
shuts off
2. Open tank drain valve
Air output lower
1. Excessive air usage
than normal / low
2. Clogged intake filter
discharge pressure
3. Open tank drain valve
4. Air leaks in piping (on machine or
in outside system)
5. Piston ring worn
6. Broken valve (in pump)
Excessive moisture
1. Excessive water in tank
in discharge air
2. High humidity
Compressor runs
1. Defective pressure switch
continuously
2. Excessive air usage
Motor hums but
1. Circuit overloaded
cannot run or runs
slowly
2. Extension cord usage - wrong
gauge wire and / or too long.
3. Loose electrical connections
4. Worn check valve
5. Defective unloader valve (on
pressure switch)
6. Defective motor capacitor(s)
7. Defective motor
Thermal overload
1 Lack of proper ventilation / room
protector cuts out
temperature too high
repeatedly
2. Clogged intake filter
3. Circuit overloaded
4. Extension cord usage - wrong
gauge wire and / or too long.
5. Worn check valve
6. Defective unloader valve (on
pressure switch)
7. Defective motor
Corrective Action
1. Plugged in? Switch on? Check fuse / breaker.
2. Reset, determine cause of problem
3. Replace
4. Turn off, let cool, turn on.
5. Bleed tank pressure down to cut-in.
1. Check for proper fuse, use time-delay fuse. Disconnect other electrical
appliances from circuit or operate compressor on its own branch circuit
2. Remove extension cord or refer to Extension Cord Chart on page 5.
3. Replace check valve
Do not disassemble check valve
with air in tank; bleed tank first.
4. Replace unloader valve.
5. Replace capacitor(s)
6. Replace motor
1. Check all connections with soap and water solution. Tighten; or remove
and apply pipe dope or pipe tape to the threads, then reassemble.
2. Close tank drain valve
1. Decrease air usage; compressor not large enough for air requirement
2. Clean or replace filter
3. Close tank drain valve
4. Check all connections with soap and water solution. Tighten; or remove
and apply pipe dope or pipe tape to the threads, then reassemble.
5. Replace piston and cylinder.
6. Replace valve
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. Disconnect other electrical appliances from circuit or operate
compressor on its own branch circuit
2. Remove extension cord or refer to Extension Cord Chart on page 5.
3. Check all electrical connections
4. Replace check valve
Do not disassemble check valve
with air in tank; bleed tank first.
5. Replace unloader valve
6. Replace capacitor(s)
7.Replace motor
1. Move compressor to well ventilated area
2. Clean or replace filter
3. Check for proper fuse, use time-delay fuse. Disconnect other electrical
appliances from circuit or operate compressor on its own branch circuit
4. Remove extension cord or refer to Extension Cord Chart on page 5.
5. Replace check valve
Do not disassemble check valve
with air in tank; bleed tank first.
6. Replace unloader valve.
7. Replace motor
7
HJ3000 Series
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