" Improper Combination of Indoor and Outdoor Units
All indoor unit models
A difference occurs in data by the type of refrigerant between indoor and outdoor units.
The number of indoor units is out of the allowable range.
Incorrect signals are transmitted among the indoor unit and outdoor unit.
The malfunction decision is made as soon as either of the abnormalities is detected.
Excess of connected indoor units
Defect of outdoor unit PCB (A1P)
Mismatching of the refrigerant type of indoor and outdoor unit
Setting of outdoor PCB was not conducted after replacing with spare PCB.
Be sure to turn off the power switch before connecting or disconnecting the connector, or parts may be damaged.
Check the LED lamps for
"Confirmation of malfunction 3"
corresponding to the malfunction code
and for Confirmation of
malfunction 4 in the monitor mode.
(Refer to P.105 · 106 for how to check.)
Troubleshooting by Indication on the Remote Controller
To Diagnosis Flow 1
(Excessive number of
indoor units connected)
To Diagnosis Flow 2
(Connection of erroneous
models of indoor units)
To Diagnosis Flow 3
(Faulty combination of