Daikin REYQ144TATJU User Manual

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Service

Manual

SiUS371614E

REYQ72-456TAYDU

REYQ72-456TATJU

Heat Recovery 60 Hz

Table of Contents

Questions and Answers:

J
jmurphyAug 9, 2025
Why is my Daikin REYQ144TATJU Heat Pump not cooling or heating air well?
- M
  Molly RobinsonAug 9, 2025
  If your Daikin Heat Pump isn't cooling or heating air effectively, check for these potential causes: * Obstructions blocking the air inlet or outlet of either the indoor or outdoor unit. Remove any obstacles. * Clogged air filters. Clean the air filters. * An enclosed outdoor unit. Remove the enclosure. * Improper temperature settings. Adjust the temperature to a suitable level. * Low airflow rate. Increase it to a proper setting. * Incorrect air diffusion direction. Adjust it to the correct direction. * Open windows or doors. Ensure they are tightly shut. * Direct sunlight exposure. Use curtains or shades on windows. * Too many people in the room. Ensure the model is appropriate for the air conditioning load.
C
Cody RichardsonAug 14, 2025
Why does my Daikin REYQ144TATJU Heat Pump make intermittent stops?
- F
  fordshaneAug 14, 2025
  If your Daikin Heat Pump system makes intermittent stops, it could be due to electrical noises from other equipment interfering with communication between the units. Try to eliminate the sources of electrical noise. Once these causes are removed, the system should automatically restart.
A
Alison HendersonAug 20, 2025
How to fix a Daikin Heat Pump that does not start at all?
- M
  Marcus ChambersAug 20, 2025
  If your Daikin Heat Pump system isn't starting, consider the following: * Blown fuse(s): Turn off the power supply and replace the fuse(s). * Tripped breaker(s): If a breaker knob is in the OFF position, turn the power supply ON. If a breaker knob is tripped, do not turn the power supply ON. * Power failure: After the power is restored, restart the system. * Loose or unplugged connector: Turn off the power supply to verify the connector's connection.
H
hesterkevinAug 27, 2025
What to do if Daikin REYQ144TATJU does not cool air well?
- A
  Ashley MckenzieAug 27, 2025
  If your Daikin Heat Pump isn't cooling air effectively, it might be in dry operation. Change the system to cooling operation.
H
hoffmankimSep 2, 2025
What to do if my Daikin REYQ144TATJU Heat Pump starts operation but makes an immediate stop?
- S
  sallymartinezSep 2, 2025
  If your Daikin Heat Pump starts and then immediately stops, it might be due to: * A blocked air inlet or outlet on either the indoor or outdoor unit. Remove any obstructions. * Clogged air filters. Clean the air filters.

Daikin REYQ144TATJU Specifications

General

Brand	Daikin
Model	REYQ144TATJU
Category	Heat Pump
Language	English

Summary

Part 1 General Information

1. Model Names of Indoor/Outdoor Units

Lists model names and specifications for indoor and outdoor units.

Part 2 Refrigerant Circuit

1. Refrigerant Circuit

Describes the overall refrigerant circuit and its components.

2. Functional Parts Layout

3. Refrigerant Flow for Each Operation Mode

Illustrates refrigerant flow paths during different operational modes.

Part 4 Functions and Control

1. Operation Flowchart (Outdoor Unit)

4. Startup Control

5. Basic Control

Covers normal operation, PI control, and compressor step control logic.

6. Protection Control

Details various protection mechanisms against high pressure, low pressure, and overcurrent.

7. Special Control

9. Outline of Control (Indoor Unit)

Part 5 Field Settings

1. Field Setting from Remote Controller

Guides on performing field settings using wired and wireless remote controllers.

2. Field Setting from Outdoor Unit

Explains how to access and operate BS buttons and DIP switches on the logic board.

Part 6 Service Diagnosis

1. Symptom-based Troubleshooting

Provides troubleshooting steps for common indoor unit operational issues.

2. Service Check Function

3. Troubleshooting by Error Code

Lists error codes and their corresponding troubleshooting procedures for diagnosis.

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