Toshiba MMD-AP0724H2UL Service Manual page 53

Using indoor unit indicators (receiving unit light block) (wireless type)
To identify the check code, check the 7-segment display on the header unit. To check for check codes not
displayed on the 7-segment display, consult the "List of Check Codes (Indoor Unit)" in "9-2. Troubleshooting
Method".
Light block Check code
Operation Timer Ready
All lights out
E01
Operation Timer Ready
E02
E03
Blinking E08
E09
E10
E12
E18
E04
Operation Timer Ready
E06
E07
Blinking
E15
E16
E19
E20
E23
E25
E26
E28
E31
Operation Timer Ready
P01
P13
Alternate blinking
P03
Operation Timer Ready
P04
P05
Alternate blinking
P07
P15
P17
P18
P19
P20
P22
P26
P29
P31
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– Power turned off or error in wiring between receiving and indoor units
Faulty reception
Faulty transmission
Loss of communication
Duplicated indoor unit No. (address)
Duplicated master remote controller
Indoor unit inter-MCU communication error
Automatic address starting error
Error or poor contact in wiring between indoor units, indoor power turned off
Error or poor contact in wiring between indoor and outdoor units
(loss of indoor-outdoor communication)
Faulty reception in indoor-outdoor communication (dropping out of indoor unit)
Faulty transmission in indoor-outdoor communication
Indoor unit not found during automatic address setting
Too many indoor units connected/overloading
Error in number of outdoor header units
Detection of refrigerant piping communication error during automatic address setting
Faulty transmission in outdoor-outdoor communication
Duplicated follower outdoor address
Faulty reception in outdoor-outdoor communication, dropping out of outdoor unit
Outdoor follower unit error
IPDU communication error
Indoor AC fan error
Outdoor liquid backflow detection error
Outdoor discharge (TD1) temperature error
Activation of outdoor high-pressure SW
Open phase/power failure
Inverter DC voltage (Vdc) error
MG-CTT error
Outdoor heat sink overheating error - Poor cooling of electrical component (IGBT) of outdoor unit
Gas leak detection - insufficient refrigerant charging
Outdoor discharge (TD2) temperature error
Outdoor discharge (TD3) temperature error
Outdoor 4-way valve reversing error
Activation of high-pressure protection
Outdoor fan IPDU error
Outdoor G-Tr short-circuit error
Compressor position detection circuit error
Shutdown of other indoor unit in group due to fault (group follower unit error)
– 53 –
: Goes off : Lighting
Cause of fault
Receiving unit
: Blinking (0.5 seconds)
Error or poor contact in wiring
between receiving and indoor
units
Setting error
MG-CTT: Magnet contactor