133
To be continued
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 com-
pressor 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 .
Check if there is audible sound
when the compressor s tarts
before the 119 failure alarm.
(Note: the duration is about 1s.)
After power supply and
upon c ompressor start, t est
the DC voltage b etween t he
second p in (black, earth wire)
and t hird p in ( brown, s igna l
wire) of t he w iring harnes s
terminal o f the two current
sensors, c onfirm i f the signa l
voltage is between
1V and 5V?
between i nverter contro l
board CN10 and module
driver board CNDR15V1 is
reliably connected?
Confirm if the wiring harnes s
between inverter control board
CN9 and module driver board
CNDR1 is reliably connected?
Replace the current sensor
with abnormal signal voltage.
Replace t he i nverter contro l
board with abnormal current
detection loop.
Correct t he w rong
connection.
Correct the wrong connection.
Y
Y
Y
N
N
N
N
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