Daikin FDA125A5VEB - Symptoms that Are NOT System Malfunctions; Symptom: the System Does Not Operate

11 | Troubleshooting
Installer and user reference guide
38
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
Malfunction Measure
The system operates but
cooling or heating is
insufficient.
▪ Check if air inlet or outlet of outdoor or indoor
unit is not blocked by obstacles. Remove any
obstacles and make sure the air can flow freely.
▪ Check if the air filter is clogged (see "10.2.1 To
clean the air filter"[433]).
▪ Check the temperature setting. Refer to the
manual of the user interface.
▪ Check if the fan speed setting is set to low speed.
Refer to the manual of the user interface.
▪ Check if the air flow angle is proper. Refer to the
manual of the user interface.
▪ Check for open doors or windows. Close doors and
windows to prevent wind from coming in.
▪ Check if direct sunlight enters the room. Use
curtains or blinds.
▪ Check if there are too many occupants in the room
during cooling operation. Check if the heat source
of the room is excessive.
▪ If the heat source of the room is excessive (when
cooling). Cooling effect decreases if heat gain of
the room is too large.
Operation stops suddenly.
(Operation lamp blinks.)
▪ Check if the air filter is clogged (see "10.2.1 To
clean the air filter"[433]).
▪ Check if air inlet or outlet of outdoor or indoor
unit is not blocked by obstacles. Remove any
obstacles, turn the breaker OFF and back ON. If
the lamp still blinks, contact your dealer.
▪ Check if all indoor units connected to outdoor unit
in the multi-system are operating in the same
mode.
An abnormal function
happens during operation.
▪ The air conditioner may malfunction because of
lightning or radio waves. Turn the breaker OFF and
back ON.
If after checking all above items, it is impossible to fix the problem yourself, contact
your installer and state the symptoms, the complete model name of the unit (with
manufacturing number if possible) and the installation date (possibly listed on the
warranty card).
11.1 Symptoms that are NOT system malfunctions
The following symptoms are NOT system malfunctions:
11.1.1 Symptom: The system does not operate
▪ The air conditioner does not start immediately after the ON/OFF button on the
user interface is pressed. If the operation lamp lights, the air conditioner is in
normal condition. It does not restart immediately because one of its safety