Haier MRV II - Page 125

Part 3
[07]communication abnormal between indoor and wired controller
modify the wiring
no
yes
if w iring o f terminal A, B, C of
wired controller is proper
no
no
no no
yes
yes
no
yes
yes
yes
no
modify the connection
if there is broken wire or port is
fixed improperly
if in group operation
if there is indoor unit
set as No. 0
set one indoor
unit as No. 0
if there are multi indoors
set as No. 0
set only one indoor
unit as No. 0
if there is indoor unti
set as No. 0
if indoor unit is running
set one indoor
unit as No. 0
check indoor PCB, if
faulty, replace it
check wired controller
PCB, if faulty, replace it
if LED2 on indoor PCB is ON,
which indicates the serial signal
sent to wired controller
no
no
yes
if LED1 on indoor PCB is ON,
which indicates the serial signal
sent from wired controller
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