General Troubleshooting - Yamaha PW3028A Service Manual

GENERAL TROUBLESHOOTING

Find the section that defines the malfunction of the pump. Turn to that section's overview page and identify the
specific problem. Then go to the solutions page for that specific problem. If you don't know what the problem is,
work your way through the problems listed until you find and correct the problem.
A. WATER SUPPLY

Check faucet. 2.5 gpm is required.

Outside diameter of hose should be ¾" or 5/8"

Maximum length of hose should be 50'.

The inlet water pressure should not exceed 90 psi.

Hose should not be kinked or damaged.
B. NOZZLE
Check function and setting of original nozzle by using an in-house nozzle. If pump functions properly with in-house
nozzle but malfunctions with original nozzle, replace nozzle.
C. Water Inlet Filter
Remove filter with pair of valve pliers.

Clean filter.

Replace filter if it is torn, bent or missing.

Reinstall filter.
NOTE: If water inlet filter is missing or damaged, further damage may have occurred inside the pump.
D. DETERGENT INJECTOR
a. Detergent not drawing

Check that nozzle is in low/chemical position.

Check that metering valve on pickup filter is open.

Check pickup filter for clog.

Check detergent tube for holes and kinks.

Remove tube from nipple

Remove detergent non-return check valve.

Inspect non-return check valve for clogs.
NOTE: Leaving detergent in pump will cause ball to stick.

Reinstall non-return check valve, nipple, metering knob and hose.
b. Nozzle Insert

Remove nozzle insert with a screwdriver.

Pull out nozzle insert.

Check nozzle for wear and damage.

Check that opening through nozzle is not clogged. Clear opening if necessary.
E. BYPASS VALVE

Unscrew pressure control nut

Pull out bypass valve.

Inspect bypass valve for damage and lubrication. Inadequate lubrication will cause valve to hang up.

Inspect O-rings for nicks or cuts. Replace if necessary.

Grease only large O-rings with silicone grease.

Replace bypass valve if necessary.
F. THERMAL RELIEF VALVE

Unscrew the safety relief valve screw cap.

Check for wear or pitting.

Replace valve if necessary.

Turn thermal relief valve hole downward.
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