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Troubleshooting Magnetic-Drive Centrifugal Pump
8 Troubleshooting
Use the instructions that follow to resolve occurrences that are not a result of defective workmanship or materials.
Problem Possible Cause Recommended Solution
The flow is insufficient or
nonexistent.
There is an air leak in the suction piping. Check the pipe connections and tighten the seals.
The pump has not been primed. Ensure the pump head is filled with fluid before starting.
The system head is higher than expected. Check the application requirements; a larger pump may
be required.
There is a closed valve. Open the suction and discharge valves.
The viscosity or specific gravity is too high. Check the fluid mixture concentrations.
The suction li is too high or there is
insufficient NPSH.
Ensure the proper inlet pressure. The pump should be
either below water level or in a fully pressurized loop.
There is a clogged suction line or impeller
vane.
Check the inlet strainer and pump lines, and remove
debris.
The motor is rotating incorrectly. Check the wiring to ensure the installed configuration
matches wiring diagram on the pump.
The pressure is low. There is air or gas in the liquid that is running
through the pump.
Bleed the air out of the system using an automatic bleeder
or manually open a bleeder line at the highest point.
The impeller diameter is too small. Check the application requirements; a larger pump may
be required.
The system head is lower than expected. Check the application requirements; a smaller pump may
be required.
The motor is rotating incorrectly. Check the wiring to ensure the installed configuration
matches the wiring diagram on the pump.
The pump is no longer
primed.
There is a leak in the suction piping. Check the pipe connections and tighten the seals.
The pump is using an
excessive amount of power.
The voltage is too low. Check the generator power output to ensure it is
maintaining the proper voltage.
The specific gravity or viscosity is too high. Check the fluid mixture concentrations.
The pump is vibrating or
making a loud noise.
The pump is cavitating from improper suction
or feed.
Ensure the proper inlet pressure is maintained. Check the
inlet strainer and the pump lines, and remove debris.
The pump is not mounted securely. Use vibration isolators between the pump mount and the
mounting surface.
9 Disposal
M
Place the packaging material in the appropriate
recycling waste bins, whenever possible. Consult
a local recycling center or specialist dealer for
details about how to dispose of the product in
accordance with all applicable national and local
regulations.
10 Warranty Information
LIMITED WARRANTY AVAILABLE AT
WWW.DOMETIC.COM/WARRANTY.
IF YOU HAVE QUESTIONS, OR TO OBTAIN A COPY
OF THE LIMITED WARRANTY FREE OF CHARGE,
CONTACT:
DOMETIC CORPORATION
MARINE CUSTOMER SUPPORT CENTER
2000 NORTH ANDREWS AVENUE
POMPANO BEACH, FLORIDA, USA 33069
1-800-542-2477
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