symptom
Possible Cause(s)
Corrective action
Compressor will not run
1. No electrical power
1. Plugged in? Switch on? Check fuse/breaker
2. Breaker open
2. Reset, determine cause of problem
3. Pressure switch bad
3. Replace
4. Motor over worked
4. Turn off, let cool, turn on.
5. Tank pressure above cut-in
5. Bleed tank pressure down to cut-in.
Fuses blow/circuit breaker
trips repeatedly
1. Incorrect size fuse, circuit overloaded 1. Check for proper fuse, use time-delay fuse.
Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit
2. Extension cord usage - wrong gauge
wire and/or too long.
2. Remove extension cord or refer to Extension Cord
Chart on page 4
3. Worn check valve
3. Replace check valve
Do not disassemble check valve
with air in tank; bleed tank
4. Defective unloader valve (on
pressure switch)
4. Replace unloader valve.
5. Defective motor capacitor(s)
5. Replace capacitor(s)
6. Defective motor
6. Replace motor
Tank pressure drops
when compressor shuts
off
1. Loose connections (fittings, tubing,
etc.)
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. Open tank drain valve
2. Close tank drain valve
3. Tank leaks
3. Check tank for leaks with soap and water solution.
If leak is detected, tank must be replaced with
genuine replacement part.
Compressor runs
continuously and/or air
output is lower than
normal/low discharge
pressure
1. Excessive air usage
1. Decrease air usage; compressor not large enough for
air requirement
2. Clogged intake filter
2. Clean or replace filter
3. Open tank drain valve
3. Close tank drain valve
4. Air leaks in piping (on machine or in
outside system)
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. Piston ring worn
5. Replace piston and cylinder.
6. Broken valve (in pump)
6. Replace valve
7. Tank leaks
7. Check tank for leaks with soap and water solution.
If leak is detected, tank must be replaced with
genuine replacement part.
8. Defective pressure switch
8. Replace switch
Excessive moisture in
discharge air
1. Excessive water in tank
1. Drain tank
2. High humidity
2. Move to area of less humidity; use air line filter
Continued on next page
6
Operating Instructions and Parts Manual
troubleshooting Chart
