SN420 Super Silent Air Pump Air Compressor 200PSI DC 12V

Tank pressure drops when

compressor(s) shut off

1. Loose drain cock

2.Check valve leaking

3. Loose connections

1. Tighten drain cock

2. Replace check valve or

compressor

3. Check all connections with

soap and water solution

and tighten

Compressor runs

continuously and air flow

lower than normal

1.Excessive air usage

2. Loose connections

3. Worn piston ring or inlet valve.

4.Clogged air filter element

1. Decrease air usage

2. Check all connections with

soap and water solution

and tighten

3. Replace compressor

4. Replace air filter element

Compressor runs

continuously causing

safety valve(if equipped)

to open

1.Faulty pressure switch

2.Defective safety valve

1. Replace pressure switch

2. Replace safety valve

Excessive moisture in

discharge

1.Excessive water in air tank

2.High humidity

1. Drain tank, tilt tank to drain.

Drain tank more frequently

2. Move compressor to area

with less humidity, or use

air line filter

1. No power, or power switch in

OFF position

2. Blown fuse

3. Motor overheats

4. Faulty pressure switch (if

hooked up to a pressure switch)

1. Make sure compressor

switch is ON

2. Disconnect compressor

from power source, replace

fuse. ( Refer to Specifications

section for correct fuse amperage)

3. Let compressor cool off for

about 30 minutes to allow t

hermal overload switch to reset

4. Replace pressure switch

Thermal overload

protector cuts out

repeatedly

1. Lack of proper ventilation or

ambient temperature is too high

2. Compressor valves failed

1. Move compressor to well

ventilated area, or area with

lower ambient temperature

2. Replace compressor

Excessive knocking

or rattling

1. Loose mounting bolts

2.Worn bearing on eccentric or

motor shaft

3.Cylinder or piston ring is worn

1. Tighten bolts

2. Replace bearing or

piston assembly

3. Replace piston or compressor