Haier MRV II Instruction Manual page 130

[46] communication abnormal with inverter board
if LED2 is on
if the communication wire with
the main board is broken down
if CNRS2 on inverter board
and CN39 on main board
are broken down
check if the other parts of
inverter board and the main
board are broken down
compressor not work
if line voltag e between P
and N on power module is
about 450VDC
if CN14 V2 output
is 15VDC
if CNVCC2
and CNVCC4 have
output signal
if communication
wire with main board
is broken down
yes
no
no
no
yes
no
replace inverter board
yes
no
replace inverte r board
yes
yes
refer to failur e [46]
1. if inverter board is electrified, if not,
no
check if the power cable is fixed well.
2. if the pa rts of inverter board are
bro ken down, if yes, change the board.
yes
replace the wire
yes
replace the inverter
board or the main board
yes
replace the inverter
board or the main board
if voltage input of yes
rectifier is normal
no
if 3-phase rectifier yes
output is abnormal
no
if electrolytic
yes
capacitor is abnormal
- 130 -
check if power input of filter
board is normal; if yes,
change filter board; if no,
check outdoor power supply
replace 3-phase rectifier
replace electrolytic capacitor
Part 3