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Maintenance
Tr
oub
leshooting
When an alarm is activated (To cancel the alarm, turn OFF the power supply, and then turn it ON again.)
Alarm list
Alarm
code
Alarm
∗
level
Description
Cause
Corrective action
Heater overheat (S4B1:CN4)
(For built-in heater model only)
DC fan motor lock error
High pressure error
(High-pressure pressure
switch (S3PH:CN6),
Activated at 4.1 MPa)
Compressor high
temperature error
(Discharge pipe
thermostat Th6, Activated at
approx. 120˚C)
(Compressor head
thermostat (S2B:CN5),
Activated at 115˚C)
Compressor (M2C) lock
System error
∗
Alarm level 1: Compressor, agitator and fan stop.
Alarm level 2: Only compressor stops.
Agitator motor inner therm
ostat (S1B:CN3) is activated
at 135˚C.
Optional protection device is
activated. (OP.)
Air temperature thermistor error
(Th5: Machine temperature tuning thermistor)
(Th3: Room temperature thermistor)
The tank liquid temperature
is higher than 60˚C.
AA
2
A6
2
E1
1
E3
2
E5
2
E6
2
EH
1
EJ
1 or 2
H1
2
FH
2
1) AKZJ type:
Insufficient oil level in tank
1) Fault of the DC fan motor
1) Internal parameter setting is invalid.
4) Any factor other than the above
5) The refrigerant gas has leaked.
2) Fan motor-control board communication
error
1) The tank liquid temperature or room tem-
perature is higher than the specified range.
2) There is an obstacle near the air
intake/exhaust port.
3) The filter is clogged, or the condenser is
dirty.
1) The tank liquid temperature or room tem-
perature is higher than the specified range.
2) There is an obstacle near the air intake/
exhaust port.
3) The filter is clogged, or the condenser is
dirty.
1) Fault of the compressor
(Replace the compressor.)
1) Because high-viscosity oil is used, the
motor is overloaded.
4) The agitator motor wiring has a break.
(Open-phase)
3) Because the power supply voltage falls
below the operating range, the current val-
ue for the agitator motor has increased.
1) The air temperature thermistor required
for control is disconnected or short-circuit-
ed.
2) There is an obstacle near the air intake/exhaust
port, resulting in cooling capacity deterioration.
4) Temperature control is disabled because the unit is
operated in Mode 9 (capacity direct designation mode).
2) Because the agitator runs with foreign
objects (cutting swarf etc.) accumulated
in the tank, the motor is overloaded.
1) The optionally-connected protection device
(or factory-connected device, if it is
incorporated in the unit) has been activated.
1) The heating value of the main machine has
exceeded the cooling capacity of the Oil
Cooling Unit. (Improper model selection)
3) The unit is running under capacity
suppressing control, because the standard
temperature (room temperature: 35˚C, tank
liquid temperature: 35˚C) has been exceeded.
Refill the operating liquid.
Check the connector insertion and wire break.
Replace the control board.
Do not place any object that blocks ventilation at 500 mm or
shorter distance from the air intake/exhaust port.
Do not place any object that blocks ventilation at 500 mm or
shorter distance from the air intake/exhaust port.
Clean inside of the tank by referring to “Maintenance/Inspection”
on page .
Identify the thermistor that indicates the error in the monitor
mode on the operation panel (“99.9” is displayed), and check
the thermistor wiring.
If the unit is properly installed and the compressor runs at
100% capacity (capacity setting can be checked in the monitor
mode), select a model that provides larger cooling capacity.
If the exhaust air temperature is almost equal to the room
temperature regardless of the compressor operation, it is possible
that the refrigerant gas has leaked. Contact DAIKIN Contact Center.
If the standard temperature is exceeded, the cooling capacity becomes
smaller than the nominal capacity, because the unit runs under capacity
suppressing control.
Make sure that the cooling capacity of the Oil Cooling Unit is larger than the
main machine heating value throughout the operating temperature range.
Do not place any object that blocks ventilation at 500 mm or
shorter distance from the air intake/exhaust port.
Select an appropriate operation mode.
(The capacity direct designation mode does not execute temperature feedback control.)
Use a coolant liquid that provides 0.5 to 200 mm
2
/s viscosity at
an oil temperature within the specified operating range.
Check the condition detected with the relevant protection device.
Clean the air filter. (See “Maintenance/Inspection” on page .)
Replace the DC fan motor.
Replace the control board.
Use the unit within the specified operating range.
Contact DAIKIN Contact Center.
Use the unit within the specified operating range.
Replace the compressor.
Check if the power supply voltage is not lower than the speci-
fied operating range. Check for an instantaneous power supply
voltage drop at startup of peripheral equipment.
Replace the agitator motor.
5) Fault of the agitator motor.
Replace the agitator motor.
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Clean the air filter. (See “Maintenance/Inspection” on page .)
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