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8-2-4. Countermeasures for Error During Test Run
• If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the
air conditioning system will automatically cease operating.
Determine the nature of the abnormality and apply corrective measures.
1 2 3 4 5 6 7 8
[Example]
When the compressor and
SV1 are on during cooling
operation.
Bit
Indication
1
Compressor
operated
2
52C
3
21S4
4
SV1
5
SV2*
6
—
7
—
8
Alw
ays lit
● Self-diagnosis function
The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch
(SW1) and LED indication (LED1, LED2) found on the outdoor multi controller circuit board.
LED indication : Set all contacts of SW1 to OFF.
● During normal operation
The LED indicates the drive state of the controller in the outdoor unit.
*SV2 is not equipped to MXZ-8C48/60NA.
Check
code
(2 digits)
Check
code
(4 digits)
Trouble
Detected Unit
Remarks
Indoor Outdoor
Remote
Controller
Ed 0403 Serial communication error
Outdoor unit Multi controller board–Power board
communication trouble
U2 1102 Compressor temperature trouble
Check delay code 1202
UE 1302 High pressure trouble
Check delay code 1402
U7 1500 Superheat due to low discharge temperature trouble
Check delay code 1600
U2 1501
Refrigerant shortage trouble
Check delay code 1601
Closed valve in cooling mode
Check delay code 1501
EF 1508 4-way valve trouble in heating mode
Check delay code 1608
UF 4100 Compressor current interruption (locked compressor)
Check delay code 4350
UP 4210 Compressor overcurrent interruption
U9 4220
Voltage shortage/overvoltage/PAM error/L1open phase/primary
current sensor error/power synchronization signal error
Check delay code 4320
U5 4230 Heat sink temperature trouble
Check delay code 4330
U6 4250 Power module trouble
Check delay code 4350
U8 4400 Fan trouble (Outdoor)
Check delay code 4500
U3 5101 Compressor temperature thermistor (TH4) open / short
U4 5102 Suction pipe temperature thermistor (TH6) open / short
U4 5105 Outdoor liquid pipe temperature thermistor (TH3) open/short Check delay code 1205
U4 5106 Ambient temperature thermistor (TH7) open/short
Check delay code 1221
U4 5109 HIC pipe temperature thermistor (TH2) open/short
Check delay code 1222
U4 5110 Heat sink temperature thermistor (TH8) open/short
Check delay code 1214
F5 5201 High pressure sensor (63HS) trouble
Check delay code 1402
F3 5202 Low pressure sensor (63LS) trouble
Check delay code 1400
UH 5300 Current sensor trouble/Primary current error
Check delay code 4310
A0 6600 Duplex address error
Only M-NET Remote controller is detected.
A2 6602 Transmission processor hardware error
Only M-NET Remote controller is detected.
A3 6603 Transmission bus BUSY error
Only M-NET Remote controller is detected.
A6 6606 Signal communication error with transmission processor
Only M-NET Remote controller is detected.
A7 6607 No ACK error
Only M-NET Remote controller is detected.
A8 6608 No response frame error
Only M-NET Remote controller is detected.
E0/E4 6831 MA communication receive error
Only MA Remote controller is detected.
E3/E5 6832 MA communication send error
Only MA Remote controller is detected.
E3/E5 6833 MA communication send error
Only MA Remote controller is detected.
E0/E4 6834
MA communication receive error
Only MA Remote controller is detected.
EF 7100 Total capacity error
EF 7101 Capacity code error
EF 7102 Connecting excessive number of units and branch boxes
EF 7105
Address setting error
EF 7130
Incompatible unit combination
NOTES:
1. When the outdoor unit detects No ACK error/No response error, an object indoor unit is treated as a stop, and not assumed to be abnormal.
2. The check codes displayed on the units may be different between the error source and others. In that case, please refer to the check code of
error source by displayed attribute and address.
3. Refer to the service manual of indoor unit or remote controller for the detail of error detected in indoor unit or remote controller.
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