134
Continued
Failure code
Outdoor digital
display tube:
119-0, 1
Indoor wired
controller77
Indoor unit LED status
LED5 Failure description:
Current detecting circuit abnormal of
compressor module
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the current sensor
is reversely connected and U
and W is in reverse direction .
◆
Check if the current sensor
is in reverse direction. (the
arrow on sensor points at the
compressor )
◆
Check if the inverter board is
well .
◆
Check if the current sensor
is well .
conditions
The current detection sensor
of inverter control board
is in abnormal conditions,
disconnected or connected
incorrectly .
4. Possible causes
◆
The inverter board and current
sensor is anti-connected or the
current sensor is in incorrect
direction.
◆
The inverter board or current
sensor is damaged.
Replace the corresponding
control boards on failure unit
with i nverter control boar d
and m odule driver boar d
respectively and check if the
control board is in abnormal?
Replace the compressor
on t he f ailure u nit to
drive with compressor in
good performance a nd
check if the compressor
is abnormal?
R eplace the abnorma l
compressor.
R eplace t he abnorma l
inverter c ontrol board or
module driver board.
Y
Y
N
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