Toshiba Super MMU-AP0091H Service Manual page 140

Check code
Main Outdoor 7-segment display
remote
Check code Sub-code
controller
H02 H02 01: Compressor 1 side
02: Compressor 2 side
H03 H03 01: Compressor 1 side
02: Compressor 2 side
H04 H04 —
H06 H06 —
H07 H07 —
Detected
AI-NET Check code name
position
central control
remote controller
1d IPDU Compressor error (lock)
MG-SW error
OCR operation
17 IPDU Current detection circuit
system error
44 I/F Compressor 1 case
thermo operation
20 I/F Low-pressure protective
operation
d7 I/F Protection for oil level
drop detection
Status Error detection condition
All stop Over-current was detected • Check compressor error.
several seconds after header
• Check power voltage. (AC380 –10%, 415V +10%).
compressor had started.
• Check cable of compressor and phase-missing.
• Check connector/terminal connection on IPDU P .C. board.
• Check conduction of case heater.
• Check outdoor P .C. board (IPDU) error.
• Check outdoor MG-SW or OCR.
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 thermo- • Check compressor 1 case thermo circuit.
stat performed protective
operation.
• Check full opening of service valve.
• 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.
All stop Low-pressure Ps detected • Check full opening of service valve.
operation lower than 0.02MPa.
• 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.
All stop The operating compressor <Check all the outdoor units in the corresponding line.>
detected oil shortage
• Check full opening of service valve of balance pipe.
continuously for 2 hours.
• Check connection and installation of TK1, TK2, TK3, and TK4
• Check characteristics of TK1, TK2, TK3, and TK4 resistance
• 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 item (position)
(Check activation error due to liquid stagnation in compressor.)
(Connector, cable, P .C. board)
(Gas and liquid side)
(Gas and liquid side)
sensors.
values.
MG-SW : Magnet Switch
OCR : Over-current Relay