Daikin REYQ72-456XATJU Service Manual Download

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SiUS371901E

Troubleshooting by Error Code

Service Diagnosis

238

3.2

Error Codes (Sub Codes)

If an error code like the one shown below is displayed when the navigation remote controller (BRC1E series) 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 252.

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 264.

A6 - 21

Low indoor airflow

Refer to page 265.

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 271.

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 276.

C1 - 08

Climate Talk Communication error

Refer to page 277.

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

C6 - 02

Indoor blower does not have required
parameters to function

Refer to page 281.

U4 - 01

Indoor-outdoor transmission error

Refer to the

flowchart.

UA - 13

Refrigerant type error

The type of refrigerant used for the indoor unit is different from
that used for the outdoor unit.

UA - 15