Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
95 Troubleshooting
3.8 “AJ” Indoor Unit: Malfunction of Capacity Determination
Device
Remote
controller display
AJ
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Capacity is determined according to resistance of the capacity setting adaptor and the memory
inside the IC memory on the indoor unit P.C.B., and whether the value is normal or abnormal is
determined.
Malfunction
Decision
Conditions
Operation and:
1. When the capacity code is not contained in the P.C.B.’s memory, and the capacity setting
adaptor is not connected.
2. When a capacity that doesn’t exist for that unit is set.
Supposed
Causes
 You have forgotten to install the capacity setting adaptor.
 Defect of indoor unit P.C.B.
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Install a capacity setting adaptor.
Replace the indoor unit P.C.B.
NO
NO
YES
YES
Replace the indoor unit P.C.B.
The indoor
unit P.C.B. was replaced
with a replacement
P. C . B .
The indoor
unit is a model that
requires installation of a
capacity setting adaptor
when replacing the
P. C . B .