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Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
01: TK1 sensor
trouble
02: TK2 sensor
trouble
H08
H08
H15
H15
—
01: TK1 oil
circuit trouble
02: TK2 oil
circuit trouble
H16
H16
1∗: Compressor
1 side
2∗: Compressor
2 side
H17
H17
1∗: Compressor
1 ide
s
2∗: Compressor
2 ide
s
H28
H28
Detected indoor
unit address
L02
L02
L03
—
—
L04
L04
—
Location
Description
System status
of
detection
I/F
Trouble in
All stop
temperature
sensor for oil
level detection
All stop
I/F
TD2 sensor
All stop
miswiring
(incomplete
insertion)
I/F
Oil level
All stop
detection
circuit trouble
Compressor
Compressor
All stop
P.C. board
trouble
(Step-out)
Compressor
Compressor
All stop
motor winding
P.C. board
trouble
Indoor unit
Outdoor units
Stop of
model
corresponding
disagreement
unit
trouble
Indoor unit
Duplicated
Stop of
indoor header
corresponding
unit
unit
I/F
Duplicated
All stop
outdoor line
address
- 189 -
Check code detection
Check items (locations)
condition(s)
Sensor resistance is infinity
• Check connection of TK1
or zero (open/short circuit).
sensor connector.
• Check resistance
characteristics of TK1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Sensor resistance is infinity
• Check connection of TK2
or zero (open/short circuit).
sensor connector.
• Check resistance
characteristics of TK2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Discharge temperature of
• Check installation of TD2
(TD2) does not increase
sensor.
despite compressor 2 being
• Check connection of TD2
in operation.
sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
No temperature change is
• Check for disconnection of
detected by TK1 despite
TK1 sensor.
compressor 1 having been
• Check resistance
started.
characteristics of TK1
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
No temperature change is
• Check for disconnection of
detected by TK2 despite
TK2 sensor.
compressor 2 having been
• Check resistance
started.
characteristics of TK2
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check SV3F valve
malfunction.
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
Compressor is in step-out
•
Check power supply
condition.
voltage. (AC460V ± 10%).
•
Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (compressor).
Abnormal compressor
• Check for failure in
current is detected
compressor.
• Check connection of
connectors/terminals on
compressor and
compressor P.C.board
• Check winding resistance
between phases of
compressor.
In case of different outdoor
• Check outdoor unit model.
unit (Not corresponded to
(Check whether the
Air to Air Heat Exchanger
outdoor unit corresponds
type)
to Air to Air Heat
Exchanger type or not.)
• Check indoor addresses.
There are more than one
header units in group.
• Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.
There is duplication in line
• Check line addresses.
address setting for outdoor
units belonging to different
refrigerant piping systems.
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Table of Contents
Troubleshooting
