Advanced Troubleshooting
26 332695C
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 30.
Pump packings are worn or
damaged.
Check for leaking around pump.
ProLTS 19: Replace pump packings. See List of
Kits, page 30.
LTS 15 and LTS 17: Replace complete pump. See
List of Kits, page 30.
Specific Problem Cause Solution
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 30.
Control board failed. See Control Board Diagnostics, page 29. Replace
damaged control board using Control Board Kit.
See List of Kits, page 30.
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