Daikin FDMQ12RVJU Service Manual

Daikin FDMQ12RVJU

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

Other manuals for Daikin FDMQ12RVJU

Manual152 pages

Installation Manual22 pages

Operation Manual12 pages

Questions and Answers:

X
xgriffinAug 14, 2025
What to do if the operation lamp is blinking on my Daikin FDMQ12RVJU?
- A
  arthur88Aug 14, 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.
A
austinemilyAug 18, 2025
Why is my Daikin Air Conditioner cooling effect poor?
- A
  Anna SmithAug 18, 2025
  If your Daikin Air Conditioner isn't cooling or heating effectively, try these steps: * Ensure the air filters are clean. * Check for and remove any obstructions blocking the air inlet or outlet of both the indoor and outdoor units. * Verify that the temperature setting is appropriate for your needs. * Make sure all windows and doors are properly closed. * Confirm that the air flow rate and direction are set correctly.
D
Danny PerezAug 21, 2025
Why Daikin FDMQ12RVJU does not operate?
- B
  Bridget BrownAug 21, 2025
  If your Daikin Air Conditioner isn't operating and the OPERATION lamp is off, check the following: * Ensure the circuit breaker hasn’t been turned OFF or a fuse hasn't blown. Check the circuit breaker. * Confirm there isn’t a power failure. * Verify that batteries are correctly installed in the remote controller. Install batteries if needed. * Check the timer setting to ensure it is correct.
N
Nathan HowardAug 25, 2025
How to fix Daikin FDMQ12RVJU Air Conditioner if operation does not start soon?
- J
  Justin PerkinsAug 25, 2025
  If your Daikin Air Conditioner operation does not start soon after pressing the ON/OFF button or reselecting the mode, you should wait for about 3 minutes.
B
Brandy DayAug 28, 2025
What to do if Daikin FDMQ12RVJU Air Conditioner operation stops suddenly?
- C
  Courtney RamirezAug 28, 2025
  If the Daikin Air Conditioner operation stops suddenly and the OPERATION lamp is flashing, it could be due to: * Dirty air filters, so clean them. * Obstructions blocking the air inlet or outlet of the indoor or outdoor units, so remove any obstacles. * Inconsistent operation modes for indoor units connected to outdoor units in a multi system, so set all indoor units to the same operation mode.
P
Priscilla MercerAug 30, 2025
Why HEAT operation stops suddenly in Daikin Air Conditioner?
- A
  Amber WhiteAug 31, 2025
  If the HEAT operation on your Daikin Air Conditioner stops suddenly and you hear a flowing sound, the system is likely removing frost from the outdoor unit. Please wait for approximately 4 to 12 minutes.
M
Melissa AlexanderSep 3, 2025
What to do if Daikin Air Conditioner operation stopped suddenly?
- K
  Kimberly RoseSep 3, 2025
  If the Daikin Air Conditioner operation stopped suddenly (OPERATION lamp is on), it might be due to a sudden large voltage fluctuation. The system is designed to protect itself and will automatically resume operation in about 3 minutes.
T
Tim RobinsonSep 7, 2025
Why does no air come out of my Daikin Air Conditioner?
- C
  Connie YoungSep 7, 2025
  If your Daikin Air Conditioner isn't emitting air, especially during HEAT operation or defrosting, allow 1 to 4 minutes for the air to start flowing. If the air conditioner operates immediately after the circuit breaker is turned on, allow 3 to 20 minutes.
B
Brad ChungSep 9, 2025
What to do if Daikin FDMQ12RVJU has an abnormal functioning during operation?
- A
  alec15Sep 10, 2025
  If your Daikin Air Conditioner is malfunctioning during operation, it might be due to lightning or radio waves. Turn the breaker OFF, then turn it ON again, and try operating the air conditioner with the remote controller.

Daikin FDMQ12RVJU Specifications

General

Category	Air Conditioner
Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Refrigerant	R32
Power Supply	50Hz
Noise Level (Outdoor Unit)	50 dB
Indoor Unit Dimensions (WxHxD)	800 x 295 x 200 mm

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