Toshiba MMD-AP0721HP-UL1 Service Manual page 56

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".
Check code
Light block
Operation Timer Ready
All lights out
Operation Timer Ready
Blinking
Operation Timer Ready
Blinking
Operation Timer Ready
Alternate blinking
Operation Timer Ready
Alternate blinking
Power turned off or trouble in wiring between receiving and indoor units
–
Trouble reception
E01
Trouble transmission
E02
Loss of communication
E03
E08 Duplicated indoor unit No. (address)
Duplicated master remote control
E09
UART communication trouble
E10
Communication trouble between Application control P.C.Board and indoor unit P.C. Board
E11
Automatic address starting trouble
E12
Trouble or poor contact in wiring between indoor units, indoor power turned off
E18
Trouble or poor contact in wiring between indoor and outdoor
E04
units (loss of indoor-outdoor communication)
Trouble reception in indoor-outdoor communication (dropping out of indoor unit)
E06
Trouble transmission in indoor-outdoor communication
E07
E15 Indoor unit not found during automatic address setting
E16 Too many indoor units connected / overloading
Trouble in number of outdoor header units
E19
Detection of refrigerant piping communication trouble during automatic address setting
E20
Trouble transmission in outdoor-outdoor communication
E23
E25 Duplicated follower outdoor address
Trouble reception in outdoor-outdoor communication, dropping out of outdoor unit
E26
Outdoor follower unit trouble
E28
IPDU communication trouble
E31
Indoor AC fan trouble
P01
Indoor overflow trouble
P10
Indoor DC fan trouble
P12
Outdoor liquid backflow detection trouble
P13
Outdoor discharge (TD1) temperature trouble
P03
P04 Activation of outdoor high-pressure SW
Open phase / power failure
Inverter DC voltage (Vdc) trouble
P05
MG-CTT trouble
Outdoor heat sink overheating trouble - Poor cooling of electrical component (IGBT) of
P07
outdoor unit
P15 Gas leak detection - insufficient refrigerant charging
Outdoor discharge (TD2) temperature trouble
P17
Outdoor discharge (TD3) temperature trouble
P18
Outdoor 4-way valve reversing trouble
P19
P20 Activation of high-pressure protection
Outdoor fan IPDU trouble
P22
Outdoor G-Tr short-circuit trouble
P26
Compressor position detection circuit trouble
P29
Shutdown of other indoor unit in group due to trouble (group follower unit trouble)
P31
: Lighting
: Goes off
Cause of trouble
Receiving unit
- 56 -
: Blinking (0.5 seconds)
Trouble or poor contact in
wiring between receiving unit
and indoor units
Setting trouble
MG-CTT: Magnet contactor