– 62 –
Main
remote
control
Check code
H06
H06
—
I/F
Activation of
low-pressure
protection
All stop
Low-pressure Ps sensor detects
operating pressure lower than
0.02MPa.
• Check service valves to confirm
full opening (both gas and liquid
sides).
• Check outdoor PMVs for clogging
(PMV1).
• Check for defect in SV2 or SV4
circuits.
• Check for defect in lowpressure
Ps sensor.
• Check indoor filter for clogging.
• Check valve opening status of
indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor fan
(during heating).
• Check for insufficiency in
refrigerant quantity.
H07
H07
—
I/F
Low oil level
protection
All stop
Operating compressor detects
continuous state of low oil level for
about 2 hours.
<All outdoor units in corresponding
line to be checked>
• Check balance pipe service valve
to confirm full opening.
• Check connection and installation
of TK1, TK2, TK4, and TK5
sensors.
• Check resistance characteristics
of TK1, TK2, TK4, and TK5
sensors.
• Check for gas or oil leak in same
line.
• Check for refrigerant problem
inside compressor casing.
• Check SV3A, SV3B, SV3C,
SV3D valves for defect.
• Check oil return circuit of oil
separator for clogging.
• Check oil equalizing circuit for
clogging.
H15
H15
—
I/F
TD2 sensor
miswiring
(incomplete
insertion)
All stop
Discharge temperature of (TD2)
does not increase despite
compressor 2 being in operation.
• Check installation of TD2 sensor.
• Check connection of TD2 sensor
connector and wiring.
• Check resistance characteristics
of TD2 sensor.
• Check for defect in outdoor P.C.
board (I/F).
H08
H08
01: TK1 sensor trouble
02: TK2 sensor trouble
04: TK4 sensor trouble
05: TK5 sensor trouble
I/F
Trouble in
temperature
sensor for oil
level detection
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Check connection of TK1 sensor
connector.
• Check resistance characteristics
of TK1 sensor.
• Check for defect in outdoor P.C.
board (I/F).
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Check connection of TK2 sensor
connector.
• Check resistance characteristics
of TK2 sensor.
• Check for defect in outdoor P.C.
board (I/F).
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Check connection of TK4 sensor
connector.
• Check resistance characteristics
of TK4 sensor.
• Check for defect in outdoor P.C.
board (I/F).
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Check connection of TK5 sensor
connector.
• Check resistance characteristics
of TK5 sensor.
• Check for defect in outdoor P.C.
board (I/F).
Outdoor 7-segment display
Check
code
Sub-code
Location
of
detection
Description
System status
Trouble detection
condition(s)
Check items (locations)
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