Daikin REYQ72TATJU User Manual

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Service

Manual

SiUS371614E

REYQ72-456TAYDU

REYQ72-456TATJU

Heat Recovery 60 Hz

Table of Contents

Questions and Answers:

M
Michael WilliamsAug 9, 2025
Why is my Daikin Heat Pump not cooling or heating air well?
- M
  matthew78Aug 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.
D
denniswilliamsAug 15, 2025
Why does my Daikin REYQ72TATJU make intermittent stops?
- L
  Lauren ClarkAug 15, 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.
M
Mrs. Jennifer Wilkerson MDAug 20, 2025
How to fix a Daikin REYQ72TATJU that does not start at all?
- M
  Miss Lori Sanchez MDAug 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.
M
Mr. Michael PaulAug 27, 2025
What to do if Daikin Heat Pump does not cool air well?
- T
  Tiffany FoxAug 27, 2025
  If your Daikin Heat Pump isn't cooling air effectively, it might be in dry operation. Change the system to cooling operation.
R
Robert AndersonSep 1, 2025
What to do if my Daikin REYQ72TATJU starts operation but makes an immediate stop?
- C
  Christine YatesSep 1, 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 REYQ72TATJU Specifications

General

Model	REYQ72TATJU
Category	Heat Pump
Refrigerant	R-410A
HSPF Rating	9.0
Cooling Capacity	72000 BTU/h

Summary

Part 1 General Information

1. Safety Cautions

Safety warnings and cautions for workers and users during operation and repair.

Part 4 Functions and Control

2. Stop Control

Conditions and procedures for system or component shutdown.

4. Startup Control

5. Basic Control

6. Protection Control

Safety mechanisms to protect components from abnormal operating conditions.

Part 5 Field Settings

1. Field Setting from Remote Controller

Instructions for configuring system parameters using the remote controller.

2. Field Setting from Outdoor Unit

Procedures for performing field settings directly on the outdoor unit's logic board.

3. Test Operation

Part 6 Service Diagnosis

1. Symptom-based Troubleshooting

Guidance for diagnosing system issues based on observed symptoms.

2. Service Check Function

3. Troubleshooting by Error Code

Detailed steps for diagnosing and resolving issues identified by specific error codes.

Part 2 Refrigerant Circuit

1. Refrigerant Circuit

Detailed explanation of the system's refrigerant circuit and components.

3. Refrigerant Flow for Each Operation Mode

Part 3 Remote Controller

5. Service Mode

Accessing and using the service mode for diagnostics and settings.

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