VIAIR Heavy Duty OBA - Manual (Page 8)

USER MANUAL
HEAVY DUTY ONBOARD AIR SYSTEM
TROUBLESHOOTING GUIDE:
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(s)
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. Repair or replace compressor
4. Replace air filter element
Compressor runs continuously
causing safety valve (if equipped)
to open 1. Bad 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.
Compressor will not run 1. No power, or power switch
in OFF position
2. Blown fuse
3. Motor overheats
4. Faulty pressure switch.
1. Make sure compressor
switch is ON
2. Disconnect compressors
from power source, replace
fuse. (Refer to Specifications
section for correct fuse
amperage.)
3. Let compressors cool off for
about 30 Minutes to allow
thermal overload switch reset.
4. Replace pressure switch
Thermal
overload protector cuts out
repeatedly 1. Lack of proper ventilation or
ambient temperature too high
2. Compressor valves failed
1. Move compressor to well
ventilated area, or area with
lower ambient temperature
2. Repair or 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 mounting bolts
2. Repair or replace
compressor
3. Repair or replace
compressor
CAUTION: NEVER DISASSEMBLE COMPRESSOR WHILE
COMPRESSOR IS PRESSURIZED.
POSSIBLE CAUSE(S) PROBLEM CORRECTIVE ACTION