Haier MRV II - Page 130

[46] communication abnormal with inverter board
Part 3
no
yes
yes
yes
no
no
yes
if LED2 is on
1. if inverter board is electrified, if not,
check if the power cable is fixed well.
2. if the parts of inverter board are
broken down, if yes, change the board.
if the communication wire with
the main board is broken down
replace the wire
if CNRS2 on inverter board
and CN39 on main board
are broken down
replace the inverter
board or the main board
check if the other parts of
inverter board and the main
board are broken down
replace the inverter
board or the main board
compressor not work
- 130 -
no
yes
yes
if line voltag e between P
and N on power module is
about 450VDC
check if power input of filter
board is normal; if yes,
change filter board; if no,
check outdoor power supply
replace 3-phase rectifier
if voltage input of
rectifier is normal
no
if 3-phase rectifier
output is abnormal
yes
no
if electrolytic
capacitor is abnormal
yes
replace electrolytic capacitor
if CN14 V2 output
is 15VDC
no
replace inverter board
yes
if C NVC C2
and CNVCC4 have
output signal
no
replace inverter board
yes
if communication
wire with main board
is broken down
yes
refer to failur e [ 46]