132
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 i f the inverter m odule is
connected to the three phase lines,
U (red), V (white) and W ( black)
correspondingly on compressor?
Check i f the current senso r
detects the current of U phase
and W phase?
Check if the s creen p rinted
arrow on c urrent senso r
points to the compressor?
Check if the harness terminal
of current sensor is connected
correspondingly to the inverter
controlling board? I s th e
connection reliable?
After power on and before
operation, 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,
is within 3V±0.2V?
Correct t he c onnection i n
accordance with t he w irin g
diagram.
Correct t he c onnection i n
accordance with t he w irin g
diagram and ensure negative
phase and phase loss a re n ot
found.
Correct t he c onnection i n
accordance with the wiring
diagram.
Correct t he connection in
accordance w ith the wiring
diagram.
Replace the current s enso r
with abnormal signal voltage.
Y
Y
Y
Y
N
N
N
N
N
To be continued
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