Fimco 5302830, Owner'S Manual

Page: 6 / 12

Page 6
Try another 12-Volt battery
Quarter turn at a time clockwise until surging stops
Defective pressure switch
Troubleshooting
Bypass is not completely closed
System has leaks
Check for worn or dirty check valve
Excessive voltage
Improper adjustment of pressure switch
Damaged or defective wiring harness
Check for proper voltage
Check for worn or dirty check valve
Low flow may cause pump to surge
Spray wand is adjusted for a small or fine spray pattern
Slightly open bypass (if applicable) to overcome
If needed, pressure switch may need to be adjusted
Pump will not run:
Low Pressure/Low Flow:
Pump surges:
Pump continues to run:
Fuse blows:
Check for loose wiring
Make sure the ON/OFF switch is on
Check the fuse
Check for defective pressure switch
Check for a clogged strainer
Cleaning the Check Valve
:
If you’re experiencing little to no pressure or the pump is not priming and you’ve checked your filter
screen and it’s clean, and you’ve gone through the other trouble shooting tips, you may need to
clean the check valve.

Remove the head of the pump, which is held on by 7 screws.

The first piece inside the head of the pump is called a check valve, it’s the part responsible for building up pressure
and pumping water/solution through the lines.

Clean the check valve under hot, soapy water (such as a good grade dish soap).
Checking the Pressure Switch
:
If your motor is not running and you’ve checked the following: for loose wiring connections, fuse, the switch on
the lead wire was “ON” and made sure you were connected to a fully charged battery and everything is fine, but
the motor won’t run, then it’s time to check to see if the pressure switch is bad.

Remove the cover off the 1” square box (pressure switch) on the head of the pump, the cover is held on by
one phillips-head screw. This will expose the two red wires.

With the pump connected to a good 12 volt power source and everything on.

Slip the two red wires off the terminals and touch them together.
If the motor runs, it means the pressure switch is bad and needs to be replaced.
If it still doesn’t run, try bypassing the switch in the lead wire or using another lead wire. Even if a
tester shows power to the pressure switch, it still could be the switch in the wire that is causing the
problem. If still not