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11.
List of error codes
In the event of a fault, the error log of the module controller and the LED display on unit controller provide a
description of the fault. The LED display on the operation panel (unit controller) shows the fault code and the
name of the fault-causing circuit. The module controller shows the date and time when the fault occurred, the
failed module and circuit names, error code and its description.
In the event of a fault, the circuit name appears in the LED display on the unit controller operation panel. The digit
"0" in the circuit name position denotes the entire module; the letter "A" denotes Circuit A, the lowercase "b"
denotes Circuit B, the letter "C" denotes Circuit C, and the lowercase "d" denotes Circuit D. The letters "C" and
"A" also signify a failure of the upstream unit (Circuits C and D) and the downstream unit (Circuits A and B)
respectively.
Error code
Item
(Hexadecimal)
00
Normal
03
Phase loss error
04
Output voltage error
Pump inverter overcurrent protection
05
operation (Note 1)
Pump inverter overvoltage protection
06
operation (Note 1)
Pump inverter overload protection
07
operation (Note 1)
Pump inverter overheat protection
08
operation (Note 1)
Pump inverter motor overload
0A
protection operation (Note 1)
Pump inverter low voltage protection
0C
operation (Note 1)
Pump inverter output loss of phase
0D
protection operation (Note 1)
Pump inverter other protection
0E
operation (Note 1)
Pump inverter communication error
0F
(Note 1)
Module controller, unit controller
10
communication error
12
Internal communication fault
1A
HIF board communication error
1B
IO board communication error
Thermistor error (chilled (warm)
20(Note3)
water entering temperature)
Thermistor error (chilled (warm)
21(Note3)
water leaving temperature)
Thermistor error (chilled (warm)
22(Note3)
water middle temperature)
Relative humidity sensor error
2E
(Note 4)
Thermistor error
2F
(outside air temperature)
Thermistor error (compressor
30
discharge gas temperature)
Thermistor error (compressor
31
suction gas temperature)
Thermistor error (coil gas
32
temperature 1) (Note 5)
Thermistor error (coil gas
33
temperature 2) (Note 5)
Thermistor error (reactor
35
temperature)
40
High-pressure sensor error
41
Low-pressure sensor error
4A
Water inlet pressure sensor error
4B
Water outlet pressure sensor error
4C
Pump suction press sensor err
Freeze prevention operation
50 (Note 7)
triggered
High temperature prevention
51
operation triggered
Low flow rate protection operation
52(Note7)
triggered
Water temperature inlet/outlet
53
reversal
5A
Subnormal pump suction press
Chilled (warm) water pressure rise
5B
protection operation
60
High pressure cut
Description
Normal
Power phase loss is detected.
EEV blown fuse
If pump inverter detects overcurrent
If pump inverter detects overvoltage
If pump inverter detects overload
If pump inverter detects overheat at heat sink
If pump inverter detects motor overload
If pump inverter detects low voltage
If pump inverter detects output loss of phase
If pump inverter detects error other than those listed above
If the inverter does not respond to communication from the CPU board
Control board communication error
(between module controller and unit controller)
If EEV does not respond to communication from the CPU board
Data cannot be received between CPU board and HIF board
If IO board does not respond to communication from the CPU board
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of applicable thermistor
Disconnection, shorting, or loose connection of the applicable sensor
Disconnection, shorting, or loose connection of the applicable sensor
Disconnection, shorting, or loose connection of the applicable sensor
Disconnection, shorting, or loose connection of the applicable sensor
Disconnection, shorting, or loose connection of the applicable sensor
Chilled/warm water outlet temperature is 2ºC or less.
Chilled/warm water outlet temperature is 60ºC or more.
Flow rate of applicable module is 100 L/min or less.
Water temperature reversal in inlet and outlet,
with a difference of 2ºC or more sustained for one minute
Continue for 1 minute with pump suction pressure of less than -40 kPa
during pump operation
Chilled (warm) water inlet pressure is 1 MPa or more.
High-pressure switch (4.15MPa) is triggered.
Circuit name
displayed
0
0
0
0
0
0
0
0
0
0
0
0
0
A,C
0
0
C
A
C
0
0
Name of applicable
circuit
Name of applicable
circuit
Name of applicable
circuit
Name of applicable
circuit
Name of applicable
circuit
Name of applicable
circuit
Name of applicable
circuit
0
0
0
Name of applicable
circuit
Name of applicable
circuit
0
0
0
0
Name of applicable
circuit
- 60 -
Stop process
None
Applicable circuit
Applicable circuit only
Applicable module
Applicable module
Applicable module
Applicable module
Applicable module
Applicable module
Applicable module
Applicable module
Applicable module
Note 2
Applicable module
Operation continues only in the case of error output
Applicable module
Only two circuits on the upstream side
Only two circuits on the downstream side
Only two circuits on the upstream side
Operation continues only in the case of error output
* Acquire outside air temperature from another module
and continue operation of the applicable module.
* If the temperature cannot be acquired from another
module, stop the applicable module.
Applicable circuit only
Applicable circuit only
Applicable circuit only
Applicable circuit only
Applicable circuit only Operation continues and only
error output is performed.
Applicable circuit only
Applicable circuit only
Applicable module
Applicable module
Operation continues only in the case of error output
Only the two circuits connected to the applicable heat
exchanger
Only the two circuits connected to the applicable heat
exchanger
Applicable module
Applicable module
Applicable module
Applicable module
Applicable circuit only
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