Haier MRV 5-RC VP1-112B Service Manual page 219

Continued
Failure code
Indoor unit LED status
Outdoor digital
display tube:
119-1, 2
Indoor wired
Outdoor unit LED status
controller77
1. Model
MRV 5-RC series
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.
Normal
Failure diagnosis and troubleshooting
Diagnosis
Replace the corresponding
control boards on failure unit
with inverter control board
and module driver board
respectively and check if the
control board is in abnormal?
N
Replace the compressor
on the failure unit to
drive with compressor in
good performance and
check if the compressor
is abnormal?
LED5 Failure description:
Current detecting circuit abnormal of
20 times compressor module
LED1 LED2
Normal
Y
Y
216
Troubleshooting
R e p l a c e t h e a b n o r m a l
inverter control board or
module driver board.
R e p l a c e t h e a b n o r m a l
compressor.