Haier MRV II - 4. Trouble diagnose and trouble shooting

Part 3
4.Trouble diagnose and trouble shooting
[46]communication between master unit connecting board and inverter board
failure
no
check master unit connecting board
if connecting board
sends serial signal to inverter board/slave
unit PCB
no
yes
yes
if connecting board
receives contineous signal from inverter
board/slave unit PCB
check master unit inverter board/slave unit PCB
check power source interference
and the external noise
[08]indoor drainage system failure/float switch circuit on indoor PCB failure
no
yes
if CN13 is fixed well
reconnect
if float switch works
if water pump works
check water pump
no
no
no
no
yes
yes
yes
yes
if C N4 is
with AC220V
voltage
modify the wiring
and the circuit
check indoor PCB and
replace it if necessary
if water
pump is electrified
modify the wiring
and the circuit
replace water pump
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