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Tech Service 1-800-888-3743
Part Number 106783, R17, 1/4/2018
Section VI - Troubleshooting
G
eneral Notes:
• Cold water will contain dissolved air Under high lift appli-
cations, the air can come out of solution blocking suction
passages This can lead to lack of priming, slow priming or
low flow rates
• Do not pump liquids containing ferrous metal fines
• If magnets decouple, stop pump immediately Operating the
pump with the magnets decoupled will eventually weaken
the magnets
• Contact our Technical Service Department at 1-800-888-
3743 or by e-mail at techservice@finishthompson com if
you have any questions regarding product operation or
repair
No or Insufficient Discharge
• Air leaks in suction piping
• Housing not filled with priming fluid
• Suction pipe smaller than 3 inches
• Suction pipe contains high spots causing trapped air pockets
• Suction pipe excessively long (flow drops as suction pipe
gets longer)
• System head higher than anticipated
• Closed valve
• Viscosity or specific gravity too high
• Motor too large for magnet coupling rating (magnets
uncoupled)
• Suction lift too high or insufficient NPSH
• Clogged suction line, suction strainer (if used) or impeller vanes
Insufficient Pressure
• Air or gas entrained liquid
• Impeller diameter too small
• System head lower than anticipated
• Motors speed insufficient (too low) or motor rotation incorrect
(correct rotation when viewed from the fan end is clockwise)
Won’t Prime
• Did not fill housing with fluid before initially starting pump
• Closed discharge valve (valve should be open or open air
vent line)
• Leak in suction piping
• Suction pipe not submerged enough (causing a vortex or
exposing the end of the suction pipe)
• Lift exceeds pump ability (see Capabilities section)
• Suction pipe diameter too large
• Specific gravity or local atmospheric pressure (altitude/elevation)
not accounted for in lift calculations
• Mismatch of inner volute and impeller diameter
• Inner volute o-ring chemically attacked, cut, brittle, etc
• Motor rotation incorrect (correct rotation when viewed from
the fan end is clockwise)
• Check valve installed too close to the pump
Primes Slowly
• Mismatch of inner volute and impeller diameter
• Suction pipe diameter too large (larger than 3 inches)
• Closed discharge valve (valve should be open)
• Inner volute o-ring chemically attacked, cut, brittle, etc
Excessive Power Consumption
• Head lower than rating
• Excessive flow
• Specific gravity or viscosity too high
Vibration/Noise
• Loose magnet
• Drive magnet rubbing
• Pump cavitating from improper suction or feed
• Motor or piping not properly secured
• Foreign object in impeller
Section VII - Warranty
Finish Thompson, Inc (manufacturer) warrants this pump product
to be free of defects in materials and workmanship for a period of
five years from date of purchase by original purchaser If a war-
ranted defect, which is determined by manufacturer’s inspection,
occurs within this period, it will be repaired or replaced at the
manufacturer’s option, provided (1) the product is submitted with
proof of purchase date and (2) transportation charges are prepaid to
the manufacturer Liability under this warranty is expressly limited
to repairing or replacing the product or parts thereof and is in lieu
of any other warranties, either expressed or implied This warranty
does apply only to normal wear of the product or components
This warranty does not apply to products or parts broken due to,
in whole or in part, accident, overload, abuse, chemical attack,
tampering, or alteration The warranty does not apply to any other
equipment used or purchased in combination with this product The
manufacturer accepts no responsibility for product damage or per-
sonal injuries sustained when the product is modified in any way
If this warranty does not apply, the purchaser shall bear all cost for
labor, material and transportation
Manufacturer shall not be liable for incidental or consequential dam-
ages including, but not limited to process down time, transportation
costs, costs associated with replacement or substitution products,
labor costs, product installation or removal costs, or loss of profit
In any and all events, manufacturer’s liability shall not exceed the
purchase price of the product and/or accessories
Warranty Registration
Thank you for your purchase of this quality Finish Thompson
product Be sure to take a minute to register your pump at
Finishthompson com/warranty Simply provide the model
number, serial number and a few other pieces of information
Ordering Spare Parts
Spare parts can be ordered from your local distributor Always refer
to the pump model to avoid error
