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.
NO
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 AC220 to 230V appear between NO
terminal L and N 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 N and 3 of
indoor unit terminal base. Is it normal?
Indoor unit controller PCB IC7 failure.
Does voltage AC350 to 415V appear at NO
DC voltage terminal?
Check broken fuse, wiring connection.
Does voltage AC220 to 230V appear between
terminai N and L of outdoor unit terminal base?
Check power supply connection.
NO
NO
NO
NO
YES
YES
YES
YES
YES
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