Countermeasures For Error During Test Run; Self-Diagnosis Function - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

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.
Check Check
code code
(2 digits) (4 digits)
Ed 0403 Serial communication error
U2 1102 Compressor temperature trouble
UE 1302 High pressure trouble
U7 1500 Superheat due to low discharge temperature trouble
Refrigerant shortage trouble
U2 1501
Closed valve in cooling mode
P6 1503 Freeze protection of Branch box or Indoor unit
EF 1508 4-way valve trouble in heating mode
PA 2500 Water leakage
P5 2502 Drain overflow protection
P4 2503 Drain sensor trouble
UF 4100 Compressor current interruption (locked compressor)
Pb 4114 Fan trouble (indoor)
Compressor overcurrent interruption/failure in 12 VDC power
UP 4210
supply circuit on power circuit board
Undervoltage/overvoltage/PAM error/L1 open phase/power
U9 4220
synchronization signal error
U5 4230 Heat sink temperature trouble
U6 4250 Power module trouble or overcurrent trouble
U8 4400 Fan trouble (outdoor)
Air inlet thermistor (TH21) open/short or
U3 5101
Compressor temperature thermistor (TH4) open/short
Liquid pipe temperature thermistor (TH22) open/short or
U4 5102
Suction pipe temperature thermistor (TH6) open/short
U4 5103 Gas pipe temperature thermistor (TH23) open/short
U4 5105 Outdoor liquid pipe temperature thermistor (TH3) open/short
U4 5106 Ambient thermistor (TH7) open/short
U4 5109 HIC pipe temperature thermistor (TH2) open/short
U4 5110 Heat sink temperature thermistor (TH8) open/short
F5 5201 High pressure sensor (63HS) trouble
F3 5202 Low pressure sensor (63LS) trouble
UH 5300 Current sensor trouble
P4 5701 Contact failure of drain float switch
A0 6600 Duplex address error
A2 6602 Transmission processor hardware error
A3 6603 Transmission bus BUSY error
A6 6606 Signal communication error with transmission processor
A7 6607 No ACK error
A8 6608 No response frame error
E0/E4 6831 MA communication receive error (no receive signal)
E3/E5 6832 MA communication send error
E3/E5 6833 MA communication send error
E0/E4 6834 MA communication receive error
EF 7100 Total capacity error
EF 7101 Capacity code error
EF 7102 Connecting unit number error
Address setting error
EF 7105
Incompatible unit combination
EF 7130
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. 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, SWP2) 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 1 2
Compressor
Indication 52C
operated
OCH760
Trouble
3 4 5 6
21S4 SV1 (SV2) SV3
Detected Unit
Remote
Indoor Outdoor
Controller
7 8
— Always lit
41
Remarks
Outdoor unit outdoor multi controller circuit board
– Power circuit board communication trouble
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.
[Example]
When the compressor and
SV1 are turned during cooling
operation.
1 2 3 4 5 6 7 8