Haier MRV III-RC Service Manual page 174

[102]
DC motor driving board EEPROM f ailure
if wire between fan motor
and module is connected
normally
yes
replace motor and module
[103]
DC motor driving board overcurrent or current sensor broken down
if wire between fan motor
and module is connected
normally
yes
if it is normal after repl acing
motor and module
yes
motor and module broken down
[104] voltage too low protection of DC motor driving board
if voltage between
P[+] and N[-] of
module >175VDC
yes
if it resumes
automatically after
being electrififed
for 3 minutes
yes
motor and
module are ok
no
re-connect and test again
no
re-connect and test again
no
no
if voltage between Land
N of module >125VAC
no
replace motor
replace module
or module
170
module is ok, replace motor and
re-test
no
yes
check wire and
input voltage