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79
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Check code
Main remote
controller
H01
H02
H03
H04
H06
H07
Outdoor 7-segment display
Check code
H01
H02
H03
H04
H06
H07
Sub-code
01: Compressor 1 side
02: Compressor 2 side
01: Compressor 1 side
02: Compressor 2 side
01: Compressor 1 side
02: Compressor 2 side
—
—
—
Detected
position
IPDU
IPDU
IPDU
I/F
I/F
I/F
Check code name
Compressor breakdown
Compressor error (lock)
MG-SW error
OCR operation
Current detection circuit
system error
Compressor 1 case
thermo operation
Low-pressure protective
operation
Protection for oil level
drop detection
Status
All stop
All stop
All stop
All stop
All stop
All stop
Error detection condition
Inverter current detection circuit detected
over-current and stopped.
Over-current was detected several seconds
after header compressor had started.
While header compressor stopped, current
flowed more than the specified current and
was detected.
Compressor 1 case thermostat performed
protective operation.
Low-pressure Ps detected operation lower
than 0.02MPa.
The operating compressor detected oil
shortage continuously for 2 hours.
Check item (position)
• Check power voltage. (AC220–240V ± 10%).
• Check compressor error.
• Check cause of abnormal overload operation.
• Check outdoor P.C. board (IPDU) error.
• Check compressor error.
• Check power voltage. (AC380 –10%, 415V +10%).
• Check cable of compressor and phase-missing.
• Check connector/terminal connection on IPDU P.C. board.
• Check conduction of case heater.
(Check activation error due to liquid stagnation in compressor.)
• Check outdoor P.C. board (IPDU) error.
• Check outdoor MG-SW or OCR.
• Check cabling of current detection circuit system.
• Check outdoor P.C. board (IPDU) error.
• Check compressor 1 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 SV41 circuit leakage.
• Check miscabling/misinstallation of SV41 and SV42.
• Check valve open status of indoor PMV.
• Check compressor error.
• Check 4-way valve error.
• Check refrigerant shortage.
• Check full opening of service valve. (Gas and liquid side)
• Check outdoor PMV clogging. (PMV1, 2)
• Check SV41 circuit and SV42 circuit error.
• Check low-pressure Ps sensor error.
• Check indoor air filter clogging.
• Check valve open of indoor PMV.
• Check refrigerant pipe clogging.
• Check outdoor fan operation. (In heating mode)
• Check refrigerant shortage.
<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.
MG-SW : Magnet Switch
OCR
: Over-current Relay
