Control Board Diagnostics
3A1222B 17
Control Board Diagnostics
Check for a damaged control board or pressure control switch as follows:
1. Relieve pressure, page 8.
2. Unplug electrical cord.
3. Remove cover screws and front cover.
4. Remove yoke and guide rods.
5. Remove gear.
6. Remove pressure control harness from control
board. Using tip of small, flat blade screwdriver,
press tab on right side connector to release.
7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
8. Turn pressure control adjustment knob clockwise to
maximum pressure setting.
9. Plug electrical cord into 120VAC receptacle.
10. Turn power switch ON.
• If motor runs, replace pressure switch.
Pressure Control Switch Kit, page 15.
• If motor does not run, replace control board
repeat test. Control Board Kit, page 15.
Pump Diagnostics
When pump packings wear, paint begins to leak down
outside of pump. Replace pump packings at the first
sign of leaking or additional damage to drive train could
occur. Use Pump Repair Kit, page 15.
Pump Service
If sprayer continues to cycle (motor and pump run) when
the spray gun trigger is released, or if performance is
poor even with new spray tips and clean filters, the
pump inlet or outlet valve may be obstructed or worn. If
a pump is worn, replace it using Pump Repair Kit (see
List of Kits, page 15).
Check for motor problems before replacing control board. A damaged motor may burn out a good
control card.
Pressure control switch does not have to be
installed in pump.
CAUTION
When repairing or cleaning the pump, never submerge
pump in water or allow fluid to enter pressure control.
CAUTION
When repairing or cleaning pump, never submerge
pump in water or allow fluid to enter pressure control.
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