Toshiba MMU-AP0121MH - Manual (Page 55)

55
Check code
Main
remote
controller
H03
H04
H06
Outdoor 7-segment display
Check code
H03
H04
H06
Auxiliary code
01: Compressor 1 side
02: Compressor 2 side
—
—
Detected
position
IPDU
I/F
I/F
Check code name
Current detection
circuit system error
Compressor 1 case
thermo operation
Low-pressure
protective operation
Status
All stop
All stop
All stop
Error detection condition
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.
Check item (position)
• 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, 3)
• Check SV41 circuit leakage.
• Check miscabling/misinstallation of SV41 and SV42.
• Check valve open status of indoor PMV.
• Check 4-way valve error.
• Check refrigerant shortage.
• Check SV5 leak.
• 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 mispiping of FS unit connecting pipe (Suction gas/Discharge gas),
wiring between FS unit and indoor unit, and connection of connectors.
Check miswiring of SVS/SVD valves.
• Check full opening of service valve.
(Discharge gas, suction gas and liquid side)
• Check outdoor PMV clogging. (PMV1, 2)
• Check SV2 circuit and SV4 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.
(All heating, mainly heating, part cooling operation)
• Check refrigerant shortage.
• Check clogging of circuit at auxiliary heat exchanger side.
(PMV3, SV12, check valve)
• Check 4-way valve error. (Reversal error)
• Check mispiping of discharge gas/suction gas main pipe.
• Check Flow selector unit.
Check miswiring of discharge gas/suction gas pipe to FS unit.
Check wiring between FS unit and indoor unit.
Check miswiring of SVD/SVS valves, misinstallation of coil.
Check opened status of SVS valve.