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1. Troubleshooting
Maintenance
Troubles
Liquid can not
be discharged.
• Priming liquid level
is too low.
• Dry running
• The foot valve
malfunction due to
foreign matter clog-
ging.
• Stop and prime the
pump and resume oper-
ation.
The pump can not be
primed.
• Clean the foot valve.
When a discharge
valve is closed.
After starting, the
pressure drops as
a discharge valve is
opened.
• Air ingress through
the suction pipe end
or seal face.
• Check if suction pip con-
nections are completely
sealed.
• Check if liquid level in
supply tank is not too
low.
• A disconnection of
the magnet coupling
• Check if the motor is not
overloaded by checking
amperage.
• Check if foreign matters
do not lock the impeller
or magnet capsule.
• Check if voltage is nor-
mal.
Pressure gauge
keeps showing low
pressure.
• Low pump speed
• The pump rotates in
reverse.
• Check wiring or motor.
• Correct wiring.
Discharge
capacity is
too low.
Pressure & vacuum
are normal.
• The strainer is
clogged with for-
eign matters.
• Remove foreign matters.
• Air pocket in suc-
tion piping
• Check and correct suc-
tion piping.
• Foreign matters are
clogged at impeller
inlet.
• Remove foreign matters.
• Air ingress from
suction pipe or seal
face.
• Check pipe connections
and retighten as neces-
sary.
• Discharge piping
clogs with foreign
matters.
• Remove foreign matters
or scale from pump/pip-
ing.
Symptom
Cause
Check
&
Countermeasures
When a discharge
valve is opened.
The readings of pressure/
vacuum gauges fluctuate
and drops to zero.
The readings of
pressure/ vacuum
gauges fluctuate and
drops to zero.
Vacuum is high.
Vacuum is very high.
The readings of pres-
sure gauge & vacu-
um gauge fluctuate.
Vacuum gauge indi-
cates high but pres-
sure is normal.
• Resistance such as
air pocket in suction
line.
• Check if there is no
arched pipework.
