Toyotomi CCT 140IUINV Service Manual page 75

Troubleshooting
2.4.1.2. Outdoor unit malfunction
Outdoor unit malfunction
Whether the outdoor
main board has error
display
No
Whether the outdoor
unit is power on
Yes
Check whether the
communication wire
between the indoor and
outdoor unit is
connected correctly
Yes
Replace outdoor main
board
check if the errors
happen again?
Yes
Replace the indoor PCB
116
Yes Refer to corresponding solving steps
No Check whether the power is on
Connect the wiring well or
No
replace the communication wire
No
Trouble is solved
Electrical Control System