haier MAGNUM 232738 - Manual (Page 20)

Control Board Diagnostics
20 309477F
Control Board Diagnostics
Check for a damaged control board or pressure control switch as follows:
1. Relieve pressure.
2. Unplug electrical cord.
3. Remove four cover screws and front cover (XR9).
Remove motor enclosure (dx).
4. Remove yoke and guide rods (XR9 model only).
5. Remove gear (XR9 model only).
6. Remove pressure control harness from control
board. Using fingernail or tip of small, flat blade
screwdriver, press tab on right side connector to
release.
7. Attach harness from a control board you know is
functioning correctly to control board.
8. Turn pressure control adjustment knob to maximum
pressure setting.
9. Plug electrical cord into 220-240 V AC receptacle.
10. Turn power switch ON.
• If motor runs, replace pressure switch.
Pressure Control Switch Kit, page 18.
• If motor does not run, replace control board
repeat test. Control Board Kit, page 18.
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 18.
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. List of Kits, page 18.
Check for motor problems before replacing control board. A damaged motor may burn out a good
control card
WARNING
Page 4, 6.
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.