Daikin REYQ-AATJA, Service Manual, Page: 284 / 495

Troubleshooting by Error Code SiUS372201EA
277 Part 6 Service Diagnosis
3.2 Error Codes (Sub Codes)
If an error code like the one shown below is displayed when a wired remote controller is in use,
make a detailed diagnosis or a diagnosis of the relevant unit.
3.2.1 Indoor Unit
Error code
Troubleshooting
Error Description Diagnosis
A0 - 01 External protection device abnormality Refer to page 292.
A6 - 01
Fan motor locked A locked fan motor current has been detected. Turn the fan
by hand to check for the connection of connectors.
A6 - 10
Fan overcurrent error A fan motor overcurrent has been detected. Check for the
connection of the connector between the fan motor and the
fan PCB. If the connection is normal, replace the fan motor.
If this still cannot solve the error, replace the fan PCB.
A6 - 11
Fan position detection error An error in the detection of position of the fan motor. Check
for the connection of the connector between the fan motor
and the fan PCB. If the connection is normal, replace the
fan motor. If this still cannot solve the error, replace the fan
PCB.
A6 - 20 Indoor fan motor status abnormality Refer to page 304.
A6 - 21 Low indoor airflow Refer to page 305.
A8 - 01 Power supply voltage error Check for the input voltage of the fan motor.
A9 - 01
Electronic expansion valve error There is an error in the electronic expansion valve coil or a
connector disconnected.
A9 - 02
Refrigerant leakage detection error Refrigerant leaks even if the electronic expansion valve is
closed. Replace the electronic expansion valve.
AA - 03 Gas furnace abnormality Refer to page 311.
AH - 03
Transmission error (between the self-cleaning decoration
panel and the indoor unit)
(when the self-cleaning decoration panel is mounted)
Check for the connection of the harness connector
between the panel PCB and the indoor unit PCB.
AH - 04
Dust detection sensor error
(when the self-cleaning decoration panel is mounted)
Check for the connections of the connector X12A on the
panel PCB and the connectors X18A and X19A on the
sensor PCB.
AH - 05
Dust collection sign error
(when the self-cleaning decoration panel is mounted)
Check for clogging with dust at the dust collection port as
well as in the brush unit, S-shaped pipe, and dust box.
Furthermore, check for any stains of the light receiving and
emitting parts of the infrared unit.
AH - 06
Air filter rotation error
(when the self-cleaning decoration panel is mounted)
Check for anything getting in the way of rotating the filter
(e.g. the filter comes off or the drive gear is clogged with
foreign matter).
AH - 07
Damper rotation error
(when the self-cleaning decoration panel is mounted)
The damper does not rotate normally. Check for any
foreign matter around the damper and for the operation of
the gear and limit switch.
AH - 08
Filter self-cleaning operation error
(when the self-cleaning decoration panel is mounted)
The unit has not yet completed the filter self-cleaning
operation even after the lapse of specified period of time.
Check for any external noise, etc.
AH - 09
Filter self-cleaning operation start disabled error
(when the self-cleaning decoration panel is mounted)
The unit has been put into a state in which the filter self-
cleaning operation is disabled. Check the unit for the
operating conditions.
AJ - 01
Capacity setting error There is an error in the capacity setting of the indoor unit
PCB.
AJ - 02
Electronic expansion valve setting error There is a fault in the setting of the gear type electronic
expansion valve/direct acting type electronic expansion
valve.
C1 - 01
Transmission abnormality between indoor unit
PCB and fan PCB
Check for the conditions of transmission between the
indoor unit PCB and the fan PCB.
C1 - 07 Blower motor communication error Refer to page 327.
C1 - 08 Climate Talk Communication error Refer to page 328.
C6 - 01
Defective combination of indoor unit PCB and the fan PCB A combination of indoor unit PCB and the fan PCB is
defective. Check whether the capacity setting adaptor is
correct and the type of the fan PCB is correct.
Blower motor HP mismatch Refer to page 331.