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Remote controller
MELANS display
display
0403
EE
F1
4103
F8
4115
A0
6600
A2
6602
A3
6603
A6
6606
A7
6607
A8
6608
undefined
EF
U2
1102
1108
U2
5104
U3
5105
U4
4101
U6
1302
UE
1300
UL
4115
F8
5101
P1
5102
P2
2503
P4
2502
P5
2500
P5
1503
P6
1504
P6
P8
1110
Depending on the position of the SW2 switch on the outdoor unit board, the segments light up to indicate the running condition of the unit and the particulars of the check
code.
SW2 setting
123456
Operation mode/relay output
000000
Outdoor unit control condition
011110
010110
Indoor unit control condition
110110
Indoor unit control condition
011100
Error code history 1
111100
Error code history 2
*1 Display system for error indicator
The indicator corresponds to the following numbers
0 ............. Outdoor unit
1 ............. Indoor unit No.1
2 ............. Indoor unit No.2
3 ............. Indoor unit No.3
4 ............. Indoor unit No.4
Serial communication error
Reverse phase, out of phase verification
Faulty input circuit
Duplicated M-NET address setting
M-NET error in PH/W transmission
M-NET bus busy
M-NET communication error with P transmission
M-NET error – no ACK
M-NET error- no response
Undefined error code
Outlet temperature error
CN23 Short-circuit Connector Unplugged
Open/short in discharge temp thermistor
Open/short in liquid temp or condenser/evaporater temp thermistor
Compressor overcurrent interruption (51C operation)
High pressure error (63H1 operation)
Low pressure error (63L operation)
Power synchronous idle circuit error
Inlet sensor error
Piping sensor error
Drain sensor error
Drain overflow protector operation
Water leak error (PDH only)
Freeze prevention operation
Surge prevention operation
Piping temperature error
Item
tens place
units place
When an error occurs, the error code
and error signal (*1) are displayed
in alternation.
Control mode display system
(IC1)
(IC2)
Indoor unit No.2
Indoor unit No.4
(IC3)
(IC4)
The error code (ex. U8, UA) and error indicator (*1) are displayed in alternation.
Error details
Display contents
O: stop
C: cooling
H: heating
d: defrosting
1: SV1
Relay output = SV1 + 21S4 + 52C
2: 21S4
4: 52C
Ex. During cooling mode, when 52C and SV1 are ON: C5
Display
0
1
2
Indoor unit No.1
3
Indoor unit No.3
4
Outdoor unit
5
6
7
Problem location
M-NET board
Outdoor unit
Outdoor unit
M-NET board
M-NET board
M-NET board
M-NET board
M-NET board
M-NET board
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Control mode
Indoor unit
Outdoor unit
Ordinary
Hot adjustment
Defrosting
Heater ON
Freeze prevention
Surge prevention
Compressor OFF
13

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