Toshiba MMD-AP0071SH-C Service Manual page 73

Check code
Outdoor 7-segment display
Main
remote
controller Check code
Sub-code
H03 H03 01: Compressor 1 side
02: Compressor 2 side
H04 H04 —
H06 H06 —
Detected
Check code name
AI-NET
position
central control
remote controller
17 IPDU Current detection
circuit system error
44 I/F Compressor 1 case
thermo operation
20 I/F Low-pressure
protective operation
Status Error detection condition
All stop While header compressor • Check cabling of current detection circuit system.
stopped, current flowed more
• Check outdoor P .C. board (IPDU) error.
than the specified current and
was detected.
All stop Compressor 1 case thermostat • Check compressor 1 case thermo circuit. (Connector, cable, P .C. board)
performed protective operation.
• 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.
All stop Low-pressure Ps detected • Check full opening of service valve.
operation lower than 0.02MPa. (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.
Check item (position)