Daikin VRV II RXYQ5MATL Service Manual page 120

Si39-504
Malfunction code
In case of an alarm code displayed on remote controller:
Cause of trouble due to faulty
installation work
The stop valve of an outdoor unit is left
closed.
The phases of the power to the outdoor
units are reversed.
No power is supplied to an outdoor or
indoor unit (including open phase).
Incorrect transmission between units
Refrigerant overcharge
Insufficient refrigerant
If an outdoor multi terminal is connected
when there is one outdoor unit installed
The operation mode on the remote
controller was changed before the check
operation.
1.1.4 Confirmation on normal operation
• Conduct normal unit operation after the check operation has been completed.
• Operate indoor unit one by one to check that the corresponding outdoor unit operates.
• Confirm that the indoor unit discharges cold air (or warm air).
• Operate the air direction control button and flow rate control button to check the function of
<Precautions for checking normal operation>
• For a period of approximately 5 minutes after the compressor stops, even if the ON/OFF
• After stopping the compressor operation using the remote controller, the outdoor unit may
• If the system is set to "nighttime automatic low noise operation setting" or "external low noise
• When the check operation is not conducted using the TEST OPERATION button at the first
Test Operation
Alarm
code
E3
E4
F3
F6
UF
U1
U1
U4
UF
E3
F6
UF
E4
F3
U7
UF
UF
E4
(When outdoor air temperature is 24°C or higher, the unit can not be operated with heating
mode. See the instruction manual attached.)
Confirm that the indoor/outdoor units can be operated normally.
(When an abnormal noise due to liquid compression by the compressor can be heard, stop
the unit immediately, and turn on the crankcase heater to heat up it sufficiently, then start
operation again.)
the devices.
button for the indoor units in the same refrigerant system is pressed, the compressor will not
operate.
conduct the residual operation for a period of 5 minutes at maximum.
level setting", the outdoor unit fan may operate at a low speed, which, however, is not a
malfunction.
test operation after installation, the malfunction code "U3" will be displayed.
Be sure to conduct the check operation according to 1.1.3 Check Operation (for details, refer
to information on the previous page.)
Countermeasure
Open the stop valve.
Exchange two of the three phases (L1, L2, L3) to make a positive
phase connection.
Check if the power wiring for the outdoor units are connected
correctly.
(If the power wire is not connected to L2 phase, no malfunction display
will appear and the compressor will not work.)
Check if the refrigerant piping line and the unit transmission wiring are
consistent with each other.
Recalculate the required amount of refrigerant from the piping length
and correct the refrigerant charge level by recovering any excessive
refrigerant with a refrigerant recovery machine.
• Check if the additional refrigerant charge has been finished
correctly.
• Recalculate the required amount of refrigerant from the piping
length and add an adequate amount of refrigerant.
Remove the line from the outdoor multi terminals (Q1 and Q2).
Set the operation mode on all indoor unit remote controllers to
"cooling".
Test Operation
109