9-3
Table 9-2(b)
Troubleshooting
Alarm
code
Description Probable
cause
Remedy
E101
E201
E301
E401
E501
No.1 overload
No.2 overload
No.3 overload
No.4 overload
No.5 overload
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.
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.
E102
E202
E302
E402
E502
No.1 discharge
pressure
abnormal drop
No.2 discharge
pressure
abnormal drop
No.3 discharge
pressure
abnormal drop
No.4 discharge
pressure
abnormal drop
No.5 discharge
pressure
abnormal drop
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 set value for starting the pump is set to a
value beyond the pump capacity.
Check the pump capacity, and set the correct
set 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.
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.
E103
E203
E303
E403
E503
No.1 electric leak
No.2 electric leak
No.3 electric leak
No.4 electric leak
No.5 electric leak
There is electric leakage somewhere in the
secondary circuit of the ground fault interrupter.
Find the location of electric leakage, and fix
the problem.
The ground fault interrupter is broken.
It is necessary to check and/or replace the
ground fault interrupter. Contact us or the
service company.
E104
E204
E304
E404
E504
No.1 high
temperature
No.2 high
temperature
No.3 high
temperature
No.4 high
temperature
No.5 high
temperature
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.
The high-temperature sensor is broken.
It is necessary to check and/or replace the
high-temperature sensor. Contact us or the
service company.
