Daikin FXDQ-M Service Manual

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Service

Manual

VRV4 indoor units

ESIE15-11A

BRYQ-A

BYCQ-D

CAV/CYV

VKM

FXKQ-M

FXFQ-P

FXCQ-A

FXSQ-P

FXDQ-M

FXUQ-A

FXFQ-A

FXMQ-P

FXHQ-A

FXDQ-A

FXZQ-A

FXAQ-P

FXLQ

FXNQ

FXSQ-A

FXTQ-A

Table of Contents

Other manuals for Daikin FXDQ-M

Engineering Data34 pages

Questions and Answers:

K
katherinedawsonAug 23, 2025
What does error code A6 mean on my Daikin FXDQ-M and how to fix it?
- G
  Gabriel ThomasAug 23, 2025
  Error code A6 on your Daikin Air Conditioner indicates a problem with the fan motor. This could be due to several reasons: * **Fan motor locked:** The RPM counter may not be sending a signal from the motor to the indoor main board when outputting. * **Fan motor overcurrent:** Check the motor power circuit. You may need to replace the fan motor or the indoor board. * **Fan motor locked:** The RPM counter may not be sending a signal even when the unit is off.
K
Kenneth GreenAug 25, 2025
What does error code CE mean on my Daikin FXDQ-M?
- A
  Alexis LongAug 26, 2025
  Error code CE on your Daikin Air Conditioner indicates a problem with an optional sensor. The issue could stem from: * **No signal from optional presence sensor:** Check the wire harness connections. * **No signal from optional floor temperature sensor:** Check the wire harness connections. * **Faulty signal from optional floor temperature sensor:** Check the pins connector for a short circuit. * **High temperature detection or electric noise floor temperature sensor:** Check the resistance of the floor temperature sensor.
H
hsmithAug 27, 2025
What does error code C4 mean on Daikin FXDQ-M Air Conditioner?
- J
  jonathanjonesAug 27, 2025
  Error code C4 on your Daikin Air Conditioner indicates a problem with the coil thermistor. This could be due to: * **Coil thermistor short circuit:** Check the coil thermistor resistance. * **Coil thermistor open circuit:** Check the wire harness connections to the coil thermistor.
A
Aaron LangAug 27, 2025
How to fix Daikin FXDQ-M error code A3?
- K
  Kimberly CookeAug 28, 2025
  Daikin Air Conditioner error code A3 indicates that the float switch is open during thermo on (cooling). To resolve this issue: * Check the float switch status. * Ensure there is no blockage in the drain pipe. * Verify that the drain pipe raiser is less than 600 mm.
C
cowanjamesAug 29, 2025
What causes Daikin FXDQ-M error code C9 and how to resolve it?
- P
  Paul WilliamsAug 29, 2025
  Daikin Air Conditioner error code C9 is related to the air thermistor. The cause may be: * **Air thermistor short circuit:** Check the air thermistor resistance. * **Air thermistor open circuit:** Check the wire harness connections to the air thermistor.
A
Amanda GriffithAug 31, 2025
Why does my Daikin FXDQ-M Air Conditioner show error code A7?
- D
  Derek HopkinsAug 31, 2025
  Daikin Air Conditioner error code A7 indicates that there is no detection contact with the swing motor. To troubleshoot: * Check if the swing motor runs when output is 230VAC. * Check the contact position detection for open and close states.
C
Colleen CollierSep 1, 2025
How to troubleshoot Daikin Air Conditioner error code C5?
- J
  James GrossSep 1, 2025
  Daikin Air Conditioner error code C5 indicates a problem with the gas thermistor. This may be caused by: * **Gas thermistor short circuit:** Check the gas thermistor resistance. * **Gas thermistor open circuit:** Check the wire harness connections to the gas thermistor.
J
jessica17Sep 2, 2025
What does Daikin FXDQ-M error code AF mean?
- S
  Steve MooreSep 3, 2025
  Daikin Air Conditioner error code AF indicates that the float switch is open during thermo off. To resolve this: * Check for drain water returning from other indoor units. * Ensure the expansion valve is correctly closing during thermo off.
C
Christopher BookerSep 4, 2025
What does error code U4 mean on Daikin FXDQ-M Air Conditioner?
- F
  fmckeeSep 4, 2025
  Daikin Air Conditioner error code U4 indicates a communication error between the indoor unit and the BS unit. Check the communication between the BS unit and the indoor unit(s).
J
Jaclyn WilliamsSep 5, 2025
What does error code U9 mean on Daikin FXDQ-M?
- D
  Dawn GutierrezSep 5, 2025
  Daikin Air Conditioner error code U9 indicates a communication error between other indoor units and the BS unit. Check other indoor units for errors other than U9.

Daikin FXDQ-M Specifications

General

Brand	Daikin
Model	FXDQ-M
Category	Air Conditioner
Language	English

Summary

Part 1. Introduction

1. Version log

Details the release history and updates of the manual.

2. System description

Explains the concept and components of the VRV4 H/R system.

3. General operation of VRV heat recovery system

Describes the operational principles of the VRV heat recovery system.

4. How to use this book

Provides guidance on navigating and using the service manual effectively.

Part 2. Troubleshooting

1. How to retrieve error code and data?

Instructions for accessing error codes and operational data from controllers.

2. Error code based troubleshooting

Lists common error codes and their causes and solutions.

Part 3. Field settings

1. Wireless remote controller BRC4C and BRC7C/E

Details how to access and configure field settings using wireless controllers.

2. Wired remote controller BRC2/3E52

Explains accessing and adjusting field settings via wired controllers BRC2/3E52.

3. Wired remote controller BRC1D51/52

Guides on accessing and modifying field settings using wired controller BRC1D51/52.

4. Wired remote controller BRC1E51

Instructions for accessing and configuring field settings with wired controller BRC1E51.

5. Wired remote controller BRC1E52

Details on accessing and setting field parameters using wired controller BRC1E52.

6. General indoor units

Covers field settings applicable to most Daikin VRV indoor units.

7. Presence sensor BRYQ140A7 (for 3x3 cassette) / BRYQ60A7 (for 2x2 cassette)

Specific settings related to presence sensors for cassette indoor units.

8. Selfcleaning panel BYCQ140D7G

Configuration options for the self-cleaning panel.

9. Aircurtain CAV/CYV

Field settings for air curtain units.

10. VKM

Field settings specific to VKM units.

11. FXSQ-A / FXNQ-A / FXDQ-A / FXMQ-P/MB / FXTQ-A

Field settings for specific indoor unit models like FXSQ, FXNQ, FXDQ etc.

12. Factory settings

Procedures for resetting unit settings to factory defaults.

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