8 Troubleshooting
Operation manual
12
FTXF20~42D5V1B
Daikin room air conditioner
3P520336-14P – 2021.09
Malfunction
Measure
The operation switch does NOT work
well.
Turn OFF the power
supply.
If the user interface display indicates the
unit number, the operation lamp flashes
and the malfunction code appears.
Notify your installer and
report the malfunction
code.
If the system does NOT operate properly except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system in accordance with the following
procedures.
INFORMATION
Refer to the reference guide located on
www.daikineurope.com/support-and-manuals/product-
information/
for more troubleshooting tips.
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).
WARNING
Stop operation and shut OFF the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electrical shock or fire. Contact your
dealer.
8.1
Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
8.1.1
Symptom: A sound like water flowing is
heard
▪ This sound is caused by the refrigerant flowing in the unit.
▪ This sound may be generated when water is flowing away from
the unit during cooling or drying operation.
8.1.2
Symptom: A blowing sound is heard
This sound is generated when the direction of the refrigerant flow is
changed (e.g. when switching from cooling to heating).
8.1.3
Symptom: A ticking sound is heard
This sound is generated when the unit slightly expands or contracts
with changes in temperature.
8.1.4
Symptom: A whistling sound is heard
This sound is generated by the refrigerant flowing during defrost
operation.
8.1.5
Symptom: A clicking sound during
operation or idle time is heard
This sound is generated when the refrigerant control valves or
electrical parts operate.
8.1.6
Symptom: A clapping sound is heard
This sound is generated when an external device sucks air out of the
room (e.g. exhaust fan, extractor hood) while the doors and windows
in the room are closed. Open the doors or windows, or turn off the
device.
8.1.7
Symptom: The outdoor fan rotates while
the air conditioner is not in operation
▪
After operation has stopped.
The outdoor fan continues to
rotate for another 30 seconds for system protection.
▪
While the air conditioner is not in operation.
When the outdoor
temperature is very high, the outdoor fan starts to rotate for
system protection.
8.2
Solving problems based on error
codes
Fault diagnosis by user interface
If the unit runs into a problem, you can identify the fault by checking
the error code by the user interface. It is important to understand the
problem and take measures before resetting the error code. This
should be done by a licensed installer or your local dealer.
INFORMATION
See the service manual for:
▪ The complete list of error codes
▪ A more detailed troubleshooting guideline for each
error
To check the error code by the user interface
1
Aim the user interface at the unit and press
for about
5 seconds.
Result:
blinks in the temperature setting display section.
2
Aim the user interface at the unit and press
repeatedly
until a continuous beep is heard.
Result:
The code is now displayed on the display.
INFORMATION
▪ A short beep and 2 consecutive beeps indicate non-
corresponding codes.
▪ To cancel the code display, hold
for 5 seconds.
The code will also disappear from the display if the
button is NOT pressed within 1 minute.
System
Error code
Description
Normal
Refrigerant shortage
Overvoltage detection
Signal transmission error (between indoor and
outdoor unit)
Indoor/outdoor unit combination fault
Indoor unit
Error code
Description
Indoor unit PCB abnormality
Freeze-up protection or high-pressure control
Fan motor (DC motor) abnormality
Indoor heat exchanger thermistor abnormality
Room temperature thermistor abnormality
Outdoor unit
Error code
Description
4-way valve abnormality
Outdoor unit PCB abnormality
Overload activation (compressor overload)
Compressor lock
