9.7 The pump supplies insufficient flow
Cause Insufficient intake due to blockage or worn parts
Remedy • Blocked foot valve. Clean the foot valve.
• The impeller is blocked or worn. Remove the
blockage or replace the worn parts.
• The diameter of the intake pipe is
insufficient. Replace it with a larger diameter
pipe.
9.8 The pump vibrates and operates noisily
Cause Loose parts or problem with flow
Remedy • Check that the pump and the pipes are firmly
anchored. Tighten or fix the loose parts.
• Cavitation in the pump, that is greater demand
than the pump's ability to deliver. Reduce the
intake height or check for load losses.
• The pump is running above its intended
maximum capacity. Limit the flow at delivery.
9.9 The pump stops unexpectedly during operation and
starts again after a while
Cause Overheating
Remedy • The thermal switch in the motor has tripped.
The motor will restart when it has cooled. If not,
check the impeller for blockage. Check that the
ambient temperature is below that stated on
the nameplate.
• If you find no blockage or high ambient
temperature, then the motor is defective.
Replace the product.
9.10 The pressure switch starts and stops frequently
during normal water delivery
Cause Incorrect pressure switch setting
Remedy • Check the setting of the pressure
switch. Increase the setting value incrementally
until the problem is resolved. Do not forget to
reset the minimum intervention pressure.
• Ensure that the air charge in the pressure tank
is set at 2 psi less than the pressure switch
setting while there is no water pressure in the
system.
• The pressure tank diaphragm is broken.
Replace the pressure tank.
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English (US)
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