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Check code
Outdoor 7-segment display
Main
remote
controller
Check code Sub-code
AI-NET
central control
remote controller
Detected
position
Check code name Status Error detection condition Check item (position)
H07 H07 — d7 I/F Protection for oil
level drop detection
All stop The operating compressor
detected oil shortage
continuously for 2 hours.
Check all the outdoor units in the corresponding line.
• Check full opening of service valve of balance pipe.
• Check connection and installation of TK1, TK2, TK3, and TK4 sensors.
• Check characteristics of TK1, TK2, TK3, and TK4 resistance values.
• Check gas leak and oil leak in the same line.
• Check refrigerant stagnation in compressor.
• Check error of SV3A, SV3B, SV3C, SV3D, and SV3E valves.
• Check clogging of oil separator oil return circuit.
• Check clogging of oil-equation circuit.
<Check clogging of oil equation pipe between compressors.>
• Check TS1, TS2 sensors (Miswiring and misinstallation of TS1 and TS2)
• Check leakage of SV6 circuit.
• Check FS unit.
Leakage of check valve of bypass between liquid pipe and discharge gas pipe
Mispiping of discharge/suction gas connection
Miswiring of SVD/SVS valve/Misinstallation of coil
• Check whether there is no setup missing of indoor unit in all cooling operation mode
All stop • Resistance value of
sensor is infinite or zero.
(Open/Short)
• Check connection of TK1 sensor connector.
• Check characteristics of TK1 sensor resistance value.
• Check outdoor P.C. board (I/F) error.
All stop • Resistance value of
sensor is infinite or zero.
(Open/Short)
• Check connection of TK2 sensor connector.
• Check characteristics of TK2 sensor resistance value.
• Check outdoor P.C. board (I/F) error.
All stop • Resistance value of
sensor is infinite or zero.
(Open/Short)
• Check connection of TK3 sensor connector.
• Check characteristics of TK3 sensor resistance value.
• Check outdoor P.C. board (I/F) error.
H08 H08
01: TK1 sensor error
02: TK2 sensor error
03: TK3 sensor error
04: TK4 sensor error
d4 I/F Oil level detective
temp sensor error
All stop • Resistance value of
sensor is infinite or zero.
(Open/Short)
• Check connection of TK4 sensor connector.
• Check characteristics of TK4 sensor resistance value.
• Check outdoor P.C. board (I/F) error.
H14 H14 — 44 I/F Compressor 2
case thermo
operation
All stop Compressor 2 case
thermostat operated.
• Check compressor 2 case thermo circuit. (Connector, cable, P.C. board)
• Check full opening of service valve. (Gas and liquid side)
• Check outdoor PMV clogging. (PMV1, 2)
• Check SV42 valve leak.
• Check miscabling/misinstallation of SV41 and SV42.
• Check valve opening of indoor PMV.
• Check 4-way valve error.
• Check refrigerant shortage.
• Check SV11 circuit. (Wiring, OFF at one side only)
• Check mispiping of discharge gas/suction gas main pipe.
• Check Flow selector unit.
Check leakage of SVD valve and SVS valve. (Check leakage of SVDD valve and SVSS.)
Check mispipin
g
of FS unit connectin
g
pipe
(
Suction
g
as/Dischar
g
e
g
as
)
, wirin
g
between
FS unit and indoor unit, and connection of connectors.
Check miswiring of SVS/SVD valves.