120
Failure code
Outdoor
digital
display tube:
76-0, 1, 2
Indoor wired
controller:
4C
Indoor unit LED status
LED5 Failure description:
Incorrect settings of quantity, address or
capacity for outdoor unit
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the quantity of
outdoor unit changes; (76-0)
◆
Check if the address of
outdoor unit changes; (76-1)
◆
Check if the horse power of
outdoor unit changes.(76-2)
conditions
Quantity of sub-unit setting
does not conform to host
EEPROM data; address of sub-
unit setting does not conform
to host EEPROM data; horse
power setting of sub-unit does
not conform to host EEPROM
data.
4. Possible causes
◆
The quantity of connected
unit changes;
◆
The horse power of outdoor
unit of the same system
changes;
◆
The address setting of the
same system changes;
Research and lock t he
outdoor unit.
Check i f the horse power of
outdoor unit changes.
Check i f the quantity o f
outdoor unit changes.
Check i f the address s etting of
outdoor unit is correct.
Research and lock t he
outdoor unit.
Replace it correctly by after-sales
personnel on site. Research and
lock the unit.
N
N
Y
Y
Y
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