Daikin FXMQ-P User 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

Questions and Answers:

J
Joseph WilsonAug 23, 2025
What does error code A6 mean on my Daikin Air Conditioner and how to fix it?
- A
  Alexander AlvaradoAug 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
kburgessAug 25, 2025
What does error code CE mean on my Daikin FXMQ-P Air Conditioner?
- C
  Carl YoderAug 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.
T
thomasdwayneAug 26, 2025
What does error code C4 mean on Daikin FXMQ-P Air Conditioner?
- J
  Jason RossAug 26, 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.
J
Jean BoltonAug 27, 2025
How to fix Daikin FXMQ-P error code A3?
- U
  ulongAug 27, 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.
K
Kimberly MitchellAug 29, 2025
What causes Daikin Air Conditioner error code C9 and how to resolve it?
- J
  Jessica ContrerasAug 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.
C
Christopher SotoAug 30, 2025
Why does my Daikin FXMQ-P Air Conditioner show error code A7?
- G
  Gerald JamesAug 30, 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.
A
Ashley WilliamsSep 1, 2025
How to troubleshoot Daikin FXMQ-P error code C5?
- C
  Cassandra DennisSep 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.
S
Sierra WillisSep 2, 2025
What does Daikin Air Conditioner error code AF mean?
- A
  Amanda JohnsonSep 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.
D
danielle85Sep 4, 2025
What does error code U4 mean on Daikin FXMQ-P?
- M
  Matthew PhillipsSep 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).
S
Sarah WrightSep 6, 2025
What does error code U9 mean on Daikin FXMQ-P?
- B
  Brian HowardSep 6, 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 FXMQ-P Specifications

General

Cooling Capacity	2.5kW - 7.1kW
Power Supply	220-240V, 50Hz
Energy Efficiency Ratio (EER)	Varies by model
Coefficient of Performance (COP)	Varies by model
Noise Level (Indoor)	19 - 45 dB

Summary

Part 1. Introduction

1. Version log

Records changes and updates made to the service manual over time.

2. System description

Explains the overall VRV4 H/R system architecture and components.

3. General operation of VRV heat recovery system

Details the operational principles of the VRV heat recovery system.

4. How to use this book

Provides guidance on navigating the manual and finding specific information.

Part 2. Troubleshooting

1. How to retrieve error code and data?

Guides users on accessing error codes and diagnostic data from remote controllers.

2. Error code based troubleshooting

Lists common error codes with their causes and recommended solutions for troubleshooting.

Part 3. Field settings

1. Wireless remote controller BRC4C and BRC7C/E

Configuration settings for Daikin's wireless remote controllers.

2. Wired remote controller BRC2/3E52

Configuration settings for BRC2/3E52 wired remote controllers.

3. Wired remote controller BRC1D51/52

Configuration settings for BRC1D51/52 wired remote controllers.

4. Wired remote controller BRC1E51

Configuration settings for BRC1E51 wired remote controllers.

5. Wired remote controller BRC1E52

Configuration settings for BRC1E52 wired remote controllers.

6. General indoor units

Common field settings applicable across various Daikin indoor units.

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

Specific field settings for presence sensor accessories.

8. Selfcleaning panel BYCQ140D7G

Field settings related to the selfcleaning panel feature.

9. Aircurtain CAV/CYV

Field settings for Daikin air curtain units.

10. VKM

Field settings specific to VKM unit models.

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

Field settings for specific indoor unit series like FXSQ, FXNQ, FXDQ, FXMQ, FXTQ.

12. Factory settings

Instructions for performing factory resets and configuring default settings.

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