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Advanced Troubleshooting
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Motor runs and pump cycles,
but pressure does not build up.
Intake valve or outlet valve is
not seating properly.
Remove and clean inlet valves and outlet valves.
Replace if necessary. See List of Kits, page 28.
Pump packings are worn or
damaged.
Check for leaking around pump.
ProX7 and ProX9: Replace pump packings. See
List of Kits, page 28.
X5 and X7: Replace complete pump. See List of
Kits, page 28.
Specific Problem Cause Solution
General Problem: Excessive Pressure Build Up
Specific Problem Cause Solution
Prime/Spray Valve actuates
automatically, relieving
pressure through drain tube.
Pressure control switch has
pinched wires or switch is
worn.
Replace pressure control switch using Pressure
Control Switch Kit, page 28.
Water or paint entered
pressure control switch or
shorted control board.
Use Pressure Control Switch Kit, to replace
switch. See List of Kits, page 28.
Control board failed. See Control Board Diagnostics, page 27.
Replace damaged control board using Control
Board Kit, page 28.