30
Maintenance and care
: Trouble shooting
Solution
Repair r
efr
iger
ation
cir
cuit
Replac
e c
ompr
essor
”
Replac
e c
ompr
essor
Replac
e run capacit
or
Replac
e TE
V
Replac
e sensor
Clean c
onnec
tion t
o
PCB
Per
for
m PCB r
eset
pr
oc
edur
e
Replac
e PCB
Per
for
m self check
W
ait f
or r
oom t
em
-
per
atur
e t
o incr
ease
Ex
cer
cise v
alv
e b
y
means of e
xt
er
nal
mag
net or b
y applying
230V
AC t
o v
alv
e c
oil
Replac
e defr
ost v
alv
e
Per
for
m PCB r
eset
pr
oc
edur
e
Replac
e PCB
Fault finding
* c
onfir
m c
ompr
essor is running
* c
onfir
m fan is running
* c
onfir
m defr
ost v
alv
e is closed (no leak)
--> No t
emper
atur
e diff
er
enc
e bet
w
een
coils
compr
essor does not star
t a
t all:
*C
onfir
m ther
e is v
oltage a
t c
ompr
essor
ter
minals
.
compr
essor tr
ies t
o star
t but will not run
(click
ing/humming fr
om c
ompr
essor):
*C
onfir
m tha
t c
ompr
essor v
oltage is
230V +/- 10 %
*C
onfir
m run capacit
or is within speci
-
fica
tions
Ver
ify if
TE
V is visually damaged:
Check f
or cr
acks and/or c
or
rosion in
TE
V
head / capillar
y tube /
TE
V sensor bulb
Confir
m sensor r
esistanc
e
Check c
onnec
tion t
o PCB f
or c
or
rosion
Confir
m sensor wir
e in
teg
rit
y
Sensor r
esistanc
e and c
onnec
tion OK -->
def
ec
tiv
e PCB
“C
onfir
m c
ompr
essor is running
Confir
m fan is running
Confir
m mag
netic defr
ost v
alv
e is closed
(no leak)”
H
issing fr
om defr
ost v
alv
e
Voltage a
t defr
ost v
alv
e c
oil when ther
e
is no ic
e on ev
apor
at
or c
oil
”
Unit b
eha
viour
LPC
o will persist un
til LP fault is tr
igger
ed af
ter 3
separ
at
e a
tt
empts t
o clear the fault c
ondition.
*C
ondition is similar t
o Expansion falv
e failur
e
LPC
o will persist un
til LP fault is tr
igger
ed af
ter 3
seper
at
e a
tt
empts t
o clear the fault c
ondition No or
irr
egular noise fr
om c
ompr
essor housing
LPC
o will persist un
til LP fault is tr
igger
ed af
ter 3
separ
at
e a
tt
empts t
o clear the fault c
ondition.
Ev
apor
at
or c
oil can build up a small amoun
t of ic
e
ar
ound
the TE
V
* c
ondition can be similar t
o r
efr
igea
tion cir
cuit leak
Unit seemingly func
tions nor
mally with no appar
en
t
fault
. E
vapor
at
or c
oil c
old
, c
ondenser c
oil w
ar
m.
Per
manen
t or per
iodic LP failur
e
No or limit
ed w
at
er fr
om dehumidifier
LPC
O fault will be per
iodically pr
esen
t
LP fault can be tr
igger
ed
Self check will r
eset fault c
ondition
No w
at
er fr
om dehumidifier
LPC
o will be per
iodically pr
esen
t
LP fault can be tr
igger
ed
Possible c
ause
Refr
iger
ation cir
cuit leak causing loss of
refr
iger
an
t
Compr
essor def
ec
tiv
e
Ther
mosta
tic Expansion
Valv
e (
TE
V
) def
ec
tiv
e
*D
ef
ec
tiv
e t
emper
atur
e sensor f
or ev
apor
at
or
coil or c
ondensor outlet tube
.
*Bad c
on
tac
t t
o ev
apor
at
or c
oil / c
ondensor
outlet tube
*Bad c
onnec
tion in plug on PCB
*PCB failur
e
*S
ensor wir
e br
eak
Special oper
ation c
onditions:
A
mbien
t t
emper
atur
e and humidit
y lo
w can
cause insufficien
t t
emper
atur
e diff
er
enc
e be
-
tw
een c
ondenser and ev
apor
at
or c
oil
, which
will tr
igger LPC
o fault
D
efr
ost v
alv
e leak
PCB failur
e causing inc
or
rec
t oper
ation of
defr
ost v
alv
e
Fault
LP c
ondition
Ty
pe
A
lar
m
D
ispla
y t
ex
t
LPC
o
