Daikin REYQ-AATJA, Service Manual, Page: 331 / 495

SiUS372201EA Troubleshooting by Error Code
Part 6 Service Diagnosis 324
3.20 Capacity Determination Device Abnormality
Applicable
Models
All indoor unit models
Error Code
AJ
Method of Error
Detection
Capacity is determined according to resistance of the capacity setting adaptor and the memory
inside the IC memory on the indoor unit control PCB, and whether the value is normal or abnormal
is determined.
Error Decision
Conditions When the capacity code is not saved to the PCB, and the capacity setting adaptor is not connected.
When a capacity that does not exist for that unit is set.
Supposed
Causes

The capacity setting adaptor was not installed.
 Defective indoor unit control PCB
Troubleshooting
N O
N O
YES
The
indoor u nit
control PCB w as
replaced w ith a
spare PCB.
YES
The
capacity
setting adaptor need
to b e installed w hen
replacing the
PCB.
Install a capacity setting
adaptor.
Replace the indoor u nit control
PCB (A1P).
Replace the indoor u nit control
PCB (A1P).
Caution
Be s u re to t u rn off the po w er s w itch b efore connecting or disconnecting
connectors, or parts may b e damaged.