9-3
Table 9-2(b)
Troubleshooting
Alarm
code
Description Probable
cause
Remedy
An overload has occurred because the unit is
running at a flow rate outside the specified
range.
Adjust the load so that it falls within the
specified range.
An overload has occurred because of damage
to the bearings.
It is necessary to replace the bearings. Contact
us or the service company.
An overload has occurred because foreign
matter is caught in the pump.
It is necessary to disassemble and inspect the
pump. Contact us or the service company.
A drop in power voltage or an imbalance
between phases has led to an increase in the
electric current value.
Check for any insufficient power capacity or
any imbalance between phases, and fix the
problem.
E101
E201
No.1 overload
No.2 overload
A failure in the motor has led to an overcurrent
flow.
It is necessary to check and/or replace the
motor. Contact us or the service company.
Because of insufficient priming or the escape of
water from the piping system, the pump cannot
lift water.
Sufficiently perform priming. If water escapes
from the piping system, Check and/or correct
the suction piping.
An entry of air through the suction piping
prevents the pump from delivering its rated
performance.
Check and/or replace the suction piping.
The discharge pressure cannot be detected
because the TJ valve is shut.
Open the TJ valve to pass water through the
pressure transmitter section.
The setting value for starting the pump is set to
a value beyond the pump capacity.
Check the pump capacity, and set the correct
setting value for starting the pump.
Because of problems such as a failure in each
pump/motor or the disconnection of the power
line, the pump does not run or the motor
rotates in reverse.
Check the rotation direction. Check and/or
correct the wiring.
If it is necessary to disassemble and inspect
the pump, contact us or the service company.
E102
E202
No.1 discharge
pressure
abnormal drop
No.2 discharge
pressure
abnormal drop
Because the suction piping, pump, or other
sections are clogged with foreign matter, the
flow passage is blocked and the pump cannot
lift water.
It is necessary to disassemble and inspect the
pump. Contact us or the service company.
There is electric leakage somewhere in the
secondary circuit of the ground fault interrupter.
Find the location of electric leakage, and fix the
problem.
E103
E203
No.1 electric leak
No.2 electric leak
The ground fault interrupter is broken.
It is necessary to check and/or replace the
ground fault interrupter. Contact us or the
service company.
Because of malfunction of the flow switch, the
pump does not stop even when no water is
used, thus leading to a high temperature.
It is necessary to check and/or replace the flow
switch. Contact us or the service company.
Water usage continues at a low flow rate
because of water leakage or other conditions.
At that time, the heat of stirring accumulates
inside the pump, thus leading to a high
temperature.
Check and/or replace the piping.
Additionally install a pressure tank with a large
capacity.
Because of damage to the diaphragm of the
pressure tank, its internal pressure cannot be
maintained when no pump is running. The
pressure drop starts running the pump even
when no water is used, thus leading to a high
temperature.
It is necessary to check and/or replace the
pressure tank. Contact us or the service
company.
Flow-in water is hotter than the specification.
Check the conditions of use, and fix the
problem.
E104
E204
No.1 high
temperature
No.2 high
temperature
The high-temperature sensor is broken.
It is necessary to check and/or replace the
high-temperature sensor. Contact us or the
service company.
