Symptom: White Mist Comes Out Of A Unit (Indoor Unit); Symptom: White Mist Comes Out Of A Unit (Indoor Unit, Outdoor Unit); Symptom: The User Interface Reads "U4" Or "U5" And Stops, But Then Restarts After A Few Minutes; Symptom: Noise Of Air Conditioners (Indoor Unit) - Daikin FDA125A5VEB Manual

11.1.2 Symptom: White mist comes out of a unit (Indoor unit)

11.1.3 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)

11.1.4 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few
minutes

11.1.5 Symptom: Noise of air conditioners (Indoor unit)

FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
devices actuates to prevent the air conditioner from being overloaded. The air
conditioner will turn on again automatically after 3 minutes.
▪ The air conditioner does not start immediately after the power supply is turned
on. Wait 1 minute until the microcomputer is prepared for operation.
▪ The air conditioner does not restart immediately when the temperature setting
button is returned to its former position after pushing. It does not restart
immediately because one of its safety devices actuates to prevent the air
conditioner from being overloaded. The air conditioner will turn on again
automatically after 3 minutes.
▪ The outdoor unit has stopped. This is because the room temperature has
reached the set temperature. The unit switches to fan operation. "
" (external control icon) is displayed on the user interface and the actual
operation is different from the user interface setting. For multi-split models, the
microcomputer executes the following control depending on the operation mode
of other indoor units.
▪ The fan speed is different from the setting. Pressing the fan speed control button
does not change the fan speed. When the room temperature reaches the set
temperature in heating mode or the unit's maximum capacity is reached, the
outdoor unit will stop operation and the indoor unit will operate in fan only
mode (low fan speed). In case of multi-split, the indoor unit alternately operates
in fan stop mode and fan only mode (LL= low fan speed). This is to prevent the
cool air from being blown directly onto anyone present in the room.
▪ When humidity is high during cooling operation (in oily and dusty places). If the
interior of an indoor unit is extremely contaminated, the temperature
distribution inside a room becomes uneven. It is necessary to clean the interior
of the indoor unit. Ask your dealer for details on cleaning the unit. This operation
requires a qualified service person.
▪ When the air conditioner is changed over to heating operation after defrost
operation. Moisture generated by defrost becomes steam and exits.
When the system is changed over to heating operation after defrost operation.
Moisture generated by defrost becomes steam and is exhausted.
This is because the user interface is intercepting noise from electric appliances
other than the air conditioner. The noise prevents communication between the
units, causing them to stop. Operation automatically restarts when the noise
ceases. A power reset may help to remove this error.
▪ A "pishi-pishi" squeaking sound is heard when the system stops after heating
operation. Expansion and contraction of plastic parts caused by temperature
change make this noise.
11 Troubleshooting
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Installer and user reference guide
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