215
Failure code
Outdoor
digital
display tube:
119-1, 2
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-RC series
Diagnosis
Troubleshooting
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.
3. Abnormity confirmation
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 starts
before the 119 failure alarm.
(Note: the duration is about 1s.)
After power supply and
upon compressor start, test
the DC voltage between the
second pin (black, earth wire)
and third pin (brown, signal
wire) of the wiring harness
terminal of the two current
sensors, confirm if the signal
voltage is between
1V and 5V?
Confirm if the wiring harness
between inverter control
board CN10 and module
driver board CNDR15V1 is
reliably connected?
Confirm if the wiring harness
between inverter control board
CN9 and module driver board
CNDR1 is reliably connected?
Replace the current sensor
with abnormal signal voltage.
Replace the inverter control
board with abnormal current
detection loop.
C o r r e c t t h e w r o n g
connection.
Correct the wrong connection.
Y
Y
Y
N
N
N
N
To be continued
Continued
Summary of Contents for MRV 5-RC AB052MAERA
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...