Symptom
Causes
Countermeasures
NVC mutual communication
error occurred.
[(09) NVC-NVC]
Power of the other vacuum control
unit is turned OFF.
Turn power of the vacuum control unit ON.
The vacuum control communication
cable has come off.
Reconnect the cable.
A unit (model NVC-2200 or NVC-
2300) other than the model NVC-
3000 was connected to the other
vacuum control unit.
Connect the model NVC-3000.
The inverter diaphragm type vacuum
pump is connected.
NVC mutual connection is not
possible when the inverter diaphragm
type vacuum pump is connected.
Use a diaphragm type vacuum pump.
The inverter pump error
occurred.
[(10) Inverter Pump]
The suction and the discharge pipes
to the vacuum pump are switched.
Remove the pipes to the vacuum pump and
the decompression container, check the
suction/discharge and reconnect the pipes.
Control wrong connection
alarm was triggered.
“(11)Control Valve”
Model CV-1 or CV-2 was connected
as the control valve.
(Models CV-1 and CV-2
：
Control
valve for NVC-2300 or older
models.)
Use the model CV-11 or CV-12.
System alarm was triggered.
“(12)System Alarm”
An alarm occurred to a related unit
(evaporator, bath, coolant circulation
unit, etc.) connected with the NVC
communication cable.
Check the related units connected and take
countermeasures by referring to the
instruction manual of each of the units.
An indication that is not
described in the instruction
manual appears.
Influences of excessive noises.
Make sure that there is no device that
generates excessive noise in the vicinity of
the unit and then turn power ON again. If
the symptom occurs again, contact your
dealer or the nearest service center.
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