Heat Pump / Cooling Only 50Hz (RX(Y)Q5~54P)
(3) Check the LED display on the outdoor unit PC-board (A1P) is as shown in the table below
LED display: 3...OFF, 4...ON, 5...Blinking
(*)How to distinguish the master unit, sub unit 1, and sub unit 2 in the multi system.
Method 1: By the H8P (MULTI) LED display
4 (ON): Master unit
Method 2: By the transmission wiring to indoor unit
Transmission wiring is connected: Master unit
Transmission wiring is not connected : Sub unit 1 or Sub unit 2
(4) Make the onsite settings as needed using the push button (BS1-BS5) on the outdoor unit
(5) Perform the check operation following the Check Operation Method of the [Service
[remote control displays malfunction code]
If any malfunction codes other than the above are displayed, check the service manual for how
and transmission is normal.
(Default status of
Sub unit 1
Sub unit 2
PC-board (A1P) with the power on. (See "1-12-2 Onsite Settings With the Power On")
Precautions] label on the EL. COMPO. BOX lid. The system operation for about 40 minutes
and automatically stops the check operation.
If the malfunction code is not displayed in the remote control after the system stop, check
operation is completed. Normal operation will be possible after 5 minutes. If the malfunction
code is displayed in the remote control, correct the malfunction following [remote control
displays malfunction code] and perform the check operation again.
The shutoff valve of the outdoor unit
is left closed.
The phases of the power to the
outdoor unit is reversed.
No power is supplied to an outdoor or
indoor unit (including phase
There is conflict on the connection of
transmission wiring in the system.
If the outdoor unit terminal is
connected when there is one outdoor
5 (Blinking): Sub unit 1
Open the shutoff valve.
Exchange two of the three phases (L1, L2, L3) to
make a proper connection.
Make sure the power source wire is properly
connected to the outdoor unit and revise if
Check if the refrigerant piping line and the
transmission wiring are consistent with each other.
Recalculate the additional amount 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 additional amount
refrigerant from the piping length and add the
Remove the line from the outdoor multi terminals
(Q1 and Q2).
L.N.O.P DEMA-ND MULTI
3 (OFF): Sub unit 2