Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 32

8-1-3. 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.
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Error Error
code code
(2 digits) (4 digits)
Ed 0403
U2 1102
UE 1302
U7 1500
U2 1501
P6 1503
EF 1508
L6 2135
PA 2500
P5 2502
P4 2503
UF 4100
Pb 4114
UP 4210
U9 4220
U5 4230
U6 4250
U8 4400
U3 5101
U4 5102
U4 5103
U4 5105
U4 5106
U4 5109
U4 5110
F5 5201
F3 5202
UH 5300
P4 5701
A0 6600
A2 6602
A3 6603
A6 6606
A7 6607
A8 6608
E0/E4 6831
E3/E5 6832
E3/E5 6833
E0/E4 6834
EF 7100
EF 7101
EF 7102
EF 7105
EF 7130
Notes:
• When the outdoor unit detects No ACK error/No response error, the target indoor unit is treated as a stop, and not assumed to be abnormal.
• The error codes displayed on the units may be different between the error source and others. In that case, please refer to the error code of error source
by displayed attribute and address.
• Refer to the service manual of indoor unit or remote controller for the detail of error detected in indoor unit or remote controller.
■ Self-diagnosis function
The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch (SW1) and LED1, LED2 (LED
indication) found on the multi-controller of the outdoor unit.
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.
Bit
Compressor
Indication
operated
• Example
When the compressor and SV1 are on during cooling operation.
1 2 3 4 5 6 7 8
OCH790 _32
Trouble
Serial communication error/Model selection SW error
Compressor temperature trouble
High pressure trouble
Superheat due to low discharge temperature trouble
Refrigerant shortage trouble
Closed valve in cooling mode
Freeze protection of plate heat exchanger
Freeze protection of branch box or indoor unit
4-way valve trouble in heating mode
Circulation water freeze protection
Water leakage
Drain overflow protection
Drain sensor abnormality
Compressor current interruption (locked compressor)
Fan trouble (Indoor unit)
Compressor overcurrent interruption
Voltage shortage/overvoltage/PAM error/L1 open
phase/primary current sensor error/power synchroni-
zation signal error
Heat sink temperature trouble
Power module trouble
Fan trouble (Outdoor unit)
Air inlet thermistor (TH21) open/short
Compressor temperature thermistor (TH4) open/short
Liquid pipe temperature thermistor (TH22) open/short
Suction pipe temperature thermistor (TH6) open/short
Gas pipe temperature thermistor (TH23) open/short
Outdoor liquid pipe temperature thermistor (TH3)
open/short
Ambient temperature thermistor (TH7) open/short
HIC pipe temperature thermistor (TH2) open/short
Heat sink temperature thermistor (TH8) open/short
High pressure sensor (63HS) trouble
Low pressure sensor (63LS) trouble
Primary current error
Contact failure of drain float switch
Duplex address error
Transmission processor hardware error
Transmission bus BUSY error
Signal communication error with transmission proces-
sor
No ACK error
No response frame error
MA communication receive error
MA communication send error
MA communication send error
MA communication receive error
Total capacity error
Capacity code error
Connecting excessive number of units and branch
boxes
Address setting error
Incompatible unit combination
1 2 3
52C 21S4
Detected Unit
Remote
Indoor Outdoor
Controller
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О
О О О
О О О
О О О
О О О
О О
О О
О О
О О
О О
О О
О
О О
О
О
О
4 5 6
SV1 (SV2) —
Remarks
Outdoor unit outdoor multi controller circuit
board
– Power circuit board communication trouble
Incorrect setting of model selection
Check delay code 1202
Check delay code 1402
Check delay code 1600
Check delay code 1601
Check delay code 1501
Check delay code 1608
Check delay code 4350
Check delay code 4320
Check delay code 4330
Check delay code 4350
Check delay code 4500
Check delay code 1202
Check delay code 1211
Check delay code 1205
Check delay code 1221
Check delay code 1222
Check delay code 1214
Check delay code 1402
Check delay code 1400
Check delay code 4310
Only M-NET Remote controller is detected.
Only M-NET Remote controller is detected.
Only M-NET Remote controller is detected.
Only M-NET Remote controller is detected.
Only M-NET Remote controller is detected.
Only M-NET Remote controller is detected.
Only MA Remote controller is detected.
Only MA Remote controller is detected.
Only MA Remote controller is detected.
Only MA Remote controller is detected.
7 8
— Always lit