To Next Page

To Previous Page

Serial Signal Receiving Error

[Check Point] Check which has a cause of error, either Indoor unit or Outdoor unit.

* Remove indoor unit front panel and cable xlampers and keep the terminal block clear so that it can be

measured with a meter.

* Remove AC power and reset the power, and press Test Operation switch on remote control.

[Check Procedure]

[Indoor Unit Check]

CAUTION: Keep out hands from terminal base and electrical components. Voltage is

applied on them and you may get electric shock.

YES

07-07

[Outdoor Unit Check]

Indoor unit control unit is normal.

Check outdoor unit control unit.

Check cable wiring of terminal base of indoor

and outdoor unit correctly connected as numbered.

Does voltage AC208 to 230V appear between NO

terminal 1 and 2 of indoor unit terminal base?

Check cable wiring of terminal base.

Does indoor unit start to operate? Conduct the inspection on "no operation at all".

Outdoor unit controller PCB board failure.

Measure voltage between terminal 2 and 3 of

indoor unit terminal base. Is it normal?

Indoor unit controller PCB IC10 failure.

Does voltage AC208 to 230V appear at NO

DC voltage terminal?

Check broken fuse, wiring connection.

Does voltage AC208 to 230V appear between

terminai 4 and 5 of outdoor unit terminal base?

Check power supply connection.

YES

Fujitsu ASU9RLQ User Manual

Questions and Answers: