Toshiba MMD-AP0481HF2UL Service Manual page 59

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 "10-2. Troubleshooting Method".
L g i t h b o l c k
Operation Timer Ready
All lights out
Operation Timer Ready
Blinking
Operation Timer Ready
Blinking
Operation Timer Ready
Alternate blinking
Operation Timer Ready
Alternate blinking
C h e c k c o d e
– Power turned off or trouble in wiring between receiving and indoor units
E01 Faulty reception
E02 Faulty transmission
E03 Loss of communication
E08 Duplicated indoor unit No. (address)
E09 Duplicated master remote control
E10 Indoor unit inter-MCU communication trouble
E12 Automatic address starting trouble
E18 Trouble or poor contact in wiring between indoor units, indoor power turned off
Trouble or poor contact in wiring between indoor and outdoor units
E04
(loss of indoor-outdoor communication)
E06 Faulty reception in indoor-outdoor communication (Signal lack of indoor unit)
E07 Faulty transmission in indoor-outdoor communication
E15 Indoor unit not found during automatic address setting
E16 Too many indoor units connected/overloading
E19 Trouble in number of outdoor header units
E20 Detection of refrigerant piping communication trouble during automatic address setting
E23 Faulty transmission in outdoor-outdoor communication
E25 Duplicated follower outdoor address
E26 Faulty reception in outdoor-outdoor communication, Signal lack of outdoor unit
E28 Outdoor follower unit trouble
E31 IPDU communication trouble, sub MCU communication trouble
P01 Indoor AC fan trouble
P13 Outdoor liquid backflow detection trouble
P03 Outdoor discharge (TD1) temperature trouble
P04 Activation of outdoor high-pressure SW
Open phase/power failure
P05 Inverter DC voltage (Vdc) trouble
MG-CTT trouble
P07 Outdoor heat sink overheating trouble - Poor cooling of electrical component (IPM) of outdoor unit
P15 Gas leak detection - insufficient refrigerant charging
P17 Outdoor discharge (TD2) temperature trouble
P18 Outdoor discharge (TD3) temperature trouble
P19 Outdoor 4-way valve reversing trouble
P20 Activation of high-pressure protection
P22 Outdoor fan IPDU trouble
P26 Outdoor IPM short-circuit trouble
P29 Compressor position detection circuit trouble
P31 Shutdown of other indoor unit in group due to fault (group follower unit trouble)
: Goes off : Lighting
C a u s e f o
Receiving unit
– 59 –
: Blinking (0.5 seconds)
a f u t l
Trouble or poor contact in
wiring between receiving and
indoor units
Setting trouble
MG-CTT: Magnet contactor