AIRLESSCO LP500 - Manual (Page 17)

Troubleshooting
3A1185H 17
Troubleshooting
Problem Cause Solution
Unit doesn’t prime Airleak due to loose suction nut Tighten suction nut.
Airleak due to worn o-rings Replace o-ring (108526) on suction seat and
o-ring (867370) below suction seat.
Airleak due to hole in suction
hose Replace suction hose.
Stuck or fouled balls Service inlet and outlet valves.
Unit primes but has poor or no
pressure Pressure set too low Turn up pressure.
Filter(s) are clogged Clean or replace gun filter, inlet filter, and/or
manifold filter.
Outlet valve fouled/worn. Service outlet valve.
Prime/pressure relief valve
bypassing Clean or replace prime/pressure relief valve
(866428).
Packings and/or piston worn Tighten packing nut, repack unit.
Unit does not maintain good
spraying pressure Blown spray tip Replace spray tip.
Packings and/or pistons worn Repack unit.
Upper seat worn Replace upper seat.
Unit does not run Blown fuse Replace fuse 20A Slow Blow (331328).
Machine does not start Control Settings Make sure machine is plugged into the wall.
Verify the on-off switch is in the ON position
and the pressure control knob is turned all the
way to the right (clockwise for maximum pres-
sure).
Pressure Control Assembly
(Board) If the power indicating light is still out after
checking the control settings and power
source, replace the pressure control assem-
bly.