Mitsubishi Electric MXZ-4C36NAHZ Technical & Service Manual page 57

8-2-4. Countermeasures for Error During Test Run
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.
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.
Bit 1
Compressor
Indication 52C
operated
*SV2 is not equipped to MXZ-8C48/60NA.
OCH573E
2 3 4 5
21S4 SV1 SV2*
Detected Unit
Remote
Indoor Outdoor
Controller
6 7 8
— — Always lit
[Example]
When the compressor and
SV1 are on during cooling
operation.
1 2 3 4 5 6 7 8