Toshiba MMU-UP0071MH-UL Service Manual page 95

Using indoor unit indicators (receiving unit light block) (wireless type)
To identify the check code, check the 7-segment display on the outdoor 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
–
Power turned off or trouble in wiring between receiving and indoor units
E01 Trouble reception
E02 Trouble transmission
E03 Loss of communication
E08 Duplicated indoor unit No. (address)
E09 Duplicated master remote controller
E10 Communication trouble between indoor unit MCU
E11 Communication trouble between Application control kit and indoor unit P.C. board
E12
Automatic address starting trouble
E17 Communication trouble between indoor unit(s) and Flow Selector unit(s).
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
Trouble reception in indoor-outdoor communication (dropping out of indoor unit)
E07 Trouble 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 Trouble transmission in outdoor-outdoor communication
E25 Duplicated follower outdoor address
E26 Trouble reception in outdoor-outdoor communication, dropping out of outdoor unit
E28
Outdoor follower unit trouble
E31 P .C. board communication trouble
P01 Indoor AC fan trouble
P10 Indoor overflow trouble
P11 Outdoor heat exchanger freezing trouble
P12
Indoor DC fan trouble
P13
Outdoor liquid backflow detection trouble
P14
Outdoor unit valve is closed
: Lighting
: Goes off
Cause of trouble
Receiving unit
– 95 –
: Blinking (0.5 seconds)
Trouble or poor contact in
wiring between receiving unit
and indoor units
Setting trouble