Carrier 40MAQB09B--3 - Compressor Top Temperature Protection Diagnosis (P0)

53
P0(Temperature protection of compressor top) error diagnosis and
solution.
Error Code P0
Malfunction decision conditions If the sampling voltage is not 5V, the LED displays the failure.
Supposed causes
S Wiring mistake
S Over load protector faulty
S System block
S Outdoor PCB faulty
Troubleshooting
C
heck the air
f
low system
of
indoor and outdoor units
Check the air flow system
of indoor and outdoor units
C
lear up the air inlet and outlet or the heat
e
xchanger o
f
indoor and outdoor units
.
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
P
ower o
ff
,
th
en restart t
h
e un
i
t
10
m
i
n
u
t
es
la
t
e
r
Power off, then restart the unit 10
minutes later
C
heck whether the
t
em
p
erature of
c
ompressor top
i
s more
tha
n
100
ć
Check whether the
temperature of
compressor top is more
than 100ć
No
C
heck the re
f
rigerant
vo
l
ume c
h
ar
g
e
Check the refrigerant
volume charge
R
ec
h
ar
g
e t
h
e correct
re
f
ri
g
erant volume
.
Recharge the correct
refrigerant volume.
R
e
f
ri
g
erant s
y
stem is blocked
,
such
a
s capillar
y
or welded point o
f
pipes
.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Yes
Check wirin
g
connection
of
the overload protecto
r
Check wiring connection
of the overload protector
C
orrect the connectio
n
.
Correct the connection.No
M
easure
th
e
r
es
i
stance
b
etween
th
e
t
wo
p
or
t
s
of
th
e
O
LP
.
I
s
i
t zero
?
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
R
eplace the
O
LP
.
Replace the OLP.
No
R
eplace the outdoor main P
C
B
.
Replace the outdoor main PCB.Yes
No
T
em
p
erature
p
rotection of com
p
ressor
t
o
p
Temperature protection of compressor
top