Midea MSC-21CRN1, Service Manual

Page: 39 / 43

Service manual
35
T he unit does not
o per ate
Does the power LED
light af ter turning
the switch on?
C heck t he elect rical
so urce.
No
Check the po wer
supplie r.
Does the volt ag e
bet wee n inpu t
terminat es o f
transformer i s
corre ct?
Does the volt ag e
bet wee n outp ut
terminat es o f
transformer i s
corre ct?
D oes the power
tr ansfer to t he
di sp lay boa rd ?
Rep lace the ma in
PCB b oard.
Yes
Yes
No
Check wirin g.
Replace the
transfo rmer.
No
No
Do th e LED lamps
indicat es ERR?
Ye s
Per f orm
the related
inst ruct io ns.
Yes
No
Is th ere beep from
the unit when using
remoter?
Ch eck t he soft
sta rter
Ch eck t he bat ter y
of the remot er. N o
Check t he displa y
board .
Replace the
disp lay boa rd .
Yes
No
Replace the
disp lay boa rd . Yes
Yes
Does the unit run in
Forced Co ol m ode?
Abnorm al n oise
from the indoor unit
Does it happ e n in
Fan On ly mod e?
Yes No
Does it happ en with
aut o swing? Check t he
swing mo to r.
Yes
Check t he
swing lou ver .
Check t he fa n
motor .
No
Check t he cross flow
fan .
Replace the b ear.
Does it just happ en
in th e beginning of
coolin g or heat in g
mode?
It is b ecause
of the h eat
rub be tween
plastics parts.
It is n orma l.
Yes
Check the inp ut
and output pip e.
No
R ecycle the ref rig e-
r ant and recha rge.
Abnorm al noise
fro m the outdoo r
uni t
D oes it happ en in
C ool mode?
Yes
Do th e fan blade rub
with t he shroud?
Check t he
motor.
Yes
Check t he
fan blad e.
C heck t he fixing nut s
of outdoo r unit.
No
Check t he
motor
supporter.
Check t he capillary.
C heck t he
co mpressor.
No
Re cycle the ref rig e-
ran t and recharg e.