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Daikin FFQ12Q2VJU - Service Manual

Daikin FFQ12Q2VJU
299 pages
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[Applied Models]
Inverter Pair : Heat Pump
Multi-Split Type Air Conditioners
5MXS-T, 4MXL-T Series
Service
Manual
SiUS121827E

Table of Contents

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Questions and Answers

  • M
    Michael MitchellAug 8, 2025
    What to do if the operation lamp is blinking on my Daikin FFQ12Q2VJU Air Conditioner?
    • S
      Stacy LoweAug 8, 2025
      If the operation lamp on your Daikin Air Conditioner is blinking, you should first perform the diagnostic procedure. Also, ensure all indoor units connected to a multi-system outdoor unit are set to the same operation mode. If they aren't, set all indoor units to the same operation mode and check if the operation lamp stops blinking. You can also try setting all indoor units to cooling or heating mode to see if the operation lamp returns to normal.
  • R
    Ronald MillerAug 18, 2025
    What to do if Daikin FFQ12Q2VJU Air Conditioner stops suddenly and the operation lamp blinks?
    • S
      Susan BrownAug 18, 2025
      If the Daikin Air Conditioner operation stops suddenly and the operation lamp blinks, it might be due to an operation mode conflict. Ensure all indoor units connected to the multi-system outdoor unit are set to the same operation mode. If they aren't, change them to the same mode and see if the blinking stops. If the mode is set to automatic, try setting all indoor units to either cooling or heating and check again.
  • S
    Scott KaneAug 28, 2025
    Why is the operation lamp blinking on my Daikin FFQ12Q2VJU Air Conditioner?
    • J
      Jeffrey FlowersAug 29, 2025
      The operation lamp on your Daikin Air Conditioner might be blinking because a protection device in either the indoor or outdoor unit has been activated, or the thermistor is malfunctioning. It could also indicate a signal transmission error between the indoor and outdoor units.

Summary

Introduction

Safety Cautions

Important warnings and cautions for ensuring safety during repair and maintenance.

Part 2 Specifications

Specifications

Technical specifications for RA Indoor Units, SA Indoor Units, and Outdoor Units.

Part 3 Printed Circuit Board Connector Wiring Diagram

Indoor Unit

Wiring diagrams for various indoor unit models, detailing PCB connector assignments.

Outdoor Unit

Wiring diagram for the Outdoor Unit Main PCB (PCB1) and Service Monitor PCB (PCB2).

Part 4 Functions and Control

Common Functions

RA Indoor Unit Functions

SA Indoor Unit Functions

Control Specification

Technical specifications for thermistor functions, mode hierarchy, and frequency control.

Part 5 Remote Controller

BRC1 E73 Wired Remote Controller

BRC082 A43 Wireless Remote Controller

BRC082 A41 W, BRC082 A42 W(S) Wireless Remote Controller

Part 6 Service Diagnosis

General Problem Symptoms and Check Items

Troubleshooting guide for common symptoms and initial check items.

Troubleshooting with LED

Guide to troubleshooting based on LED indications for indoor and outdoor units.

Service Diagnosis

Code Indication on Remote Controller

Lists error codes indicated on remote controllers for RA, SA, and Outdoor units.

Troubleshooting for RA Indoor Unit

Troubleshooting steps for RA indoor unit abnormalities like PCB, fan motor, and thermistor issues.

Troubleshooting for SA Indoor Unit

Troubleshooting steps for SA indoor unit abnormalities like PCB, fan motor, and sensors.

Troubleshooting for Outdoor Unit

Troubleshooting for outdoor unit issues including refrigerant shortage, voltage, wiring, and PCB faults.

Part 7 Trial Operation and Field Settings

Pump Down Operation

Forced Cooling Operation

Wiring Error Check Function

Procedure for activating and interpreting the wiring error check function.

Trial Operation

Field Settings

Daikin FFQ12Q2VJU Specifications

General IconGeneral
BrandDaikin
ModelFFQ12Q2VJU
CategoryAir Conditioner
LanguageEnglish

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