2WAY VRF SYSTEM
Test Run
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8. Self-Diagnosis Function Table and
Contents of Alarm Display
59
Wired remote
control display
Detected contents
<<F01>>
Indoor thermistor is either open or damaged.
E1 thermistor on liquid side of indoor heat exchanger has failure. (E1)
<<F02>>
Indoor unit set as single split. (E2)
<<F03>>
E3 thermistor on gas side of indoor heat exchanger has failure. (E3)
<<F10>>
TA thermistor for intake air temperature (room temperature) of the indoor
unit has failure. (TA)
<<F11>>
BL thermistor for supply air temperature of the indoor unit has failure.
(BL)
F04
Outdoor thermistor is either open or damaged.
DISCH1 thermistor at the discharge of 1st compressor reading is
abnormal.
F05
DISCH2 thermistor at the discharge of 2nd compressor reading is
abnormal.
F06
EXG1 thermistor at the gas side of 1st heat exchanger of the outdoor
unit has failure. (EXG1)
F07
EXL1 thermistor at the liquid side of 1st heat exchanger of the outdoor
unit has failure. (EXL1)
F08
TO thermistor for outdoor ambient air temperature has failure. (TO)
F12
SCT thermistor at the suction refrigerant of compressors has failure.
(SCT)
F14
SCG thermistor at the outlet of subcooling heat exchanger in outdoor
unit has failure. (SCG)
F16
High pressure sensor of the outdoor unit has failure. (HPS)
F17
Low pressure sensor of the outdoor unit has failure. (LPS)
F23
EXG2 thermistor at the gas side of 2nd heat exchanger of the outdoor
unit has failure. (EXG2)
F24
EXL2 thermistor at the liquid side of 2nd heat exchanger of the outdoor
unit has failure. (EXL2)
<<P01>>
Protective device in indoor unit is activated.
Indoor fan motor activated thermal protector.
<<P09>>
Connection to the panel of indoor unit is not good.
<<P10>>
Float switch of drain pan safety is activated.
<<P12>>
Indoor fan inverter protection control is activated.
P14
Input detected at EXCT terminal on indoor PCB for refrigerant detector.
P03
Protective device in outdoor unit is activated.
1st compressor discharge temperature too high.
P04
Protection device activated. High pressure switch (63PH, 63PH1 or
63PH2) or compressor thermal protector (49C1 / 49C2).
P05
Missing phase in power input is detected at HIC for 1st compressor.
P15
Missing phase in power input is detected at HIC for 2nd compressor.
P16
Overcurrent of 1st compressor on the secondary side of inverter circuit,
or inverter failed to syncronize with rotation.
P17
2nd compressor discharge temperature too high.
P19
Inverter for 2nd compressor failed to start or failed to syncronize with
rotation.
P20
Too high load in refrigerant circuit.
P22
Fan motor or inverter drive of outdoor unit has failure.
P26
Overcurrent of 2nd compressor on the secondary side of inverter circuit,
or inverter failed to syncronize with rotation.
P29
Inverter for 1st compressor failed to start or failed to syncronize with
rotation.
<P31>
Indoor unit communication error of group control
wiring.
Other indoor unit in group control has an alarm.
F29
EEPROM on indoor unit PCB failure
F31
EEPROM on outdoor unit PCB failure
H01
Protective device for compressor No. 1 is
activated.
Overcurrent in 1st compressor.
H03
Current sensor for the 1st compressor is disconnected or shorted.
H05
DISCH1 thermistor at the discharge of 1st compressor is disconnected,
shorted or misplaced. (DISCH1)
H11
Protective device for compressor No. 2 is
activated.
Overcurrent in 2nd compressor.
H13
Current sensor for the 2nd compressor is disconnected or shorted.
H15
DISCH2 thermistor at the discharge of 2nd compressor is disconnected,
shorted or misplaced. (DISCH2)
H06
Low pressure is too low.
H08
Oil sensor fault. (Disconnection, etc.)
OIL1 thermistor for the oil of 1st compressor has failure. (OIL1)
H27
OIL2 thermistor for the oil of 2nd compressor has failure. (OIL2)
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Wired remote
control display
Detected contents
H21
Abnormal device function
HIC for 2nd compressor has failure. Overcurrent or overheat of HIC.
H31
HIC for 1st compressor has failure. Overcurrent or overheat of HIC.
•
The parentheses of << >> used in the table of alarm display does not affect anything the operation of other indoor units.
•
The parentheses of < > used in the table of alarm display implies that there are two cases: according to the content of the
symptom, some affect the operation of other indoor units and others do not affect anything.
Alarm messages displayed on system controller
Serial
communication
errors
Mis-setting
Error in transmitting serial
communication signal
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
C05
Error in receiving serial
communication signal
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
CN1 is not connected properly.
C06
Activation of
protective
device
Protective device of sub indoor
unit in group control is activated.
When using wireless remote controller or system controller, in order to
check the alarm message in detail, connect wired remote controller to
indoor unit temporarily.
P30
NOTE
1. Alarm messages in << >> do not affect other indoor unit operations.
2. Alarm messages in < > sometimes affect other indoor unit operations depending on the fault.
ATTENTION!
Adjustment of terminating resistance (pin) is necessary.
Communication failure will occur unless adjustment is made correctly.
•
Terminating resistance (pin) is mounted on outdoor unit control P.C. board.
•
When connecting central controller, interface or peripheral equipment, adjustment of terminating resistance (pin) is necessary.
Although the connection is not made, confirmation is necessary for VRF systems.
•
In the case of a refrigerant system, the terminating resistance (pin) for this inter-unit control wiring (S-LINK wiring) is one
location (See the section “5. Auto Address Setting”).
For 2 or more refrigerant systems, 2 locations should be valid (“SHORT” for VRF systems at shipment). See the section
“5. Auto Address Setting”.
In order to make 2 locations valid, let the terminating resistance (pin) of the nearest outdoor unit and the farthest outdoor unit
be valid (SHORT side) from the location of central controller.
In other refrigerant systems excepting 2 locations described above, make them invalid (OPEN side).
It is prohibited making more than 3 locations of terminating resistance valid.
•
Since the use of linking the sub outdoor units of VRF systems is not connected to the inter-unit control wiring, it is not necessary
to make the terminating resistance invalid “OPEN side”.
Make final confirmation regarding the central controller or interface & inter-unit control wiring (S-LINK wiring) connected to the
peripheral equipment.
Measure the line resistance with a tester and check whether the values are in the range of 30 - 120 .
If the resistance values are out of range, check again the terminating resistance.
Nevertheless, if the values are out of range, the problem comes from wiring.
•
Is the connection properly made?
•
Are there any scratches or damages on the coated surface?
•
Measure the line, between wires and ground with the 500V megger (insulation
resistance meter) and check the values are over 100M .
•
When measuring, be sure to remove both edges of the wire from the terminal board.
If not removed, it will be damaged.
•
If the line resistance is within 100M , newly carry out the wiring work.
Megger
Line
Between wires and ground
(Wire)
(Wire)
(Wire)
(Wire)
(Ground)
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