Troubleshooting (continued)
27
PROBLEM
CAUSE
SOLUTION
Pump will not turn on
Bad electrical connection
Check battery connections
Short in wires
Check condition of wires
Thermal protector activated
Wait for motor to cool
Fuse blown
Replace fuse
Faulty pressure switch
Replace pressure switch assembly
Faulty relay
Replace relay
Incorrect voltage
Check 12V voltage (±10%)
Pump will not prime
Water supply empty
Refill supply container
Inlet air leak
Tighten fittings/
Replace cracked fittings or hoses
Clogged suction strainer
Remove debris
Air lock
Squeeze spray gun trigger
Inlet/ Outlet tube restriction
Remove restriction
Clogged intake valves
Remove obstruction
Low pressure/ flow
Inlet air leak
Tighten fittings/ Replace cracked
fittings or hoses
Pump not primed
Refer to Start-up and priming in the
Operation section
Clogged suction strainer
Remove debris
Clogged nozzle
Remove obstruction
Faulty regulator
Replace regulator
Worn valves
Replace valves
Inlet/ Outlet tube restriction
Remove restriction
Incorrect voltage
Check 12V voltage (±10%)
Clogged valves
Remove obstruction
Electrical connection wires to
battery too long or undersized
Use 12 gauge wire (4.0mm
2
) up to
12ft (3.6m) long. Use 10 gauge wire
(5.0mm
2
) over 12ft (3.6m) long. Do
not exceed 25ft (7.6m).
Pump leaks
Plunger seals worn
Replace pump head assembly
Pump cycles while not
spraying – (Demand
mode with regulator
adjustment knob
completely tightened)
Leak in the system
Tighten leaking hose clamps/ fittings
Regulator bypass seal worn
Replace regulator
Faulty pressure switch
Replace pressure switch assembly
Rough operation
Flexible mounting surface
Mount pump on rigid surface
Loose pump head
Tighten fasteners
Compressed base feet
Decompress base feet
Stuck check valve
Clean or replace valve(s)
Cavitation
Remove inlet restriction
Rigid plumbing
Plumb pump with flexible plumbing
