Haier MRV5-H - Page 115

112
Failure code
Outdoor
digital
display tube:
45
Indoor wired
controller:
2D
Indoor unit LED status
LED5 Failure description:
Communications between outdoor units
failure.
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Incorrect order of outdoor
communication wire ;
◆
Incorrect wiring of outdoor
communication wire ;
◆
Incorrect terminal
connection of outdoor
communication wire ;
◆
Incorrect setting of address
dip switch of outdoor unit;
conditions
No communication for 30s (E)
4. Possible causes
◆
Poor communication
wire: short circuit or
disconnection;
◆
Non-corresponding
communication wire A, B and
C;
◆
Incorrect connection of
outdoor unit communication
port of PCB ;
◆
Interference source,
which causes unstable
communication of outdoor
unit .
Replace i t correctly by after-
sales personnel on site.
Check if the communication wire
between the outdoor units is normal.
Check if t he address DIP switch
of outdoor unit is correct.
Check if there is interference source in the
position where the outdoor unit is installed.
Power off the outdoor unit and research it.
Replace the outdoor unit PCB
Reset it correctly b y after -
sales personnel on site.
Clear the interference
source.
N
N
N
Y
Y
Y
N