Carrier 38MBRCQ36AA3 - Condenser High Temperature Protection; PC 0 A Protection Diagnosis

38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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PC 0A (High Temperature Protection of Condenser Diagnosis and Solution)
Description: When the outdoor pipe temperature is more than 65°C, the unit stops. It starts again only when the outdoor pipe temperature is less than
52°C.
Recommended parts to prepare:
• Connection wires
• Condenser temperature sensor
• Outdoor fan
• Outdoor main PCB
• Refrigerant
Troubleshooting and repair:
Is the condenser temperature
higher than 65°C ?
Yes
Is the resistance o
f
condenser tem
p
.
sensor
N
o
rm
al
?
Is the resistance of
condenser temp. sensor
normal ?
Replace the temperature sensor
No
No
Is the
ou
t
doo
r
a
m
b
ient
temperature hi
g
her than
50
ć
/
54
/
/
ć
(
)
?
Is the outdoor ambient
temperature higher than
50ć/54 ć(tropical models)?
No
S
to
p
the uni
t
Stop the unit
Yes
Is the
ou
t
doo
r
u
nit
ventilation
f
unctionin
g
?
Is the outdoor unit
ventilation functioning
properly?
Yes
Ensure t
h
at t
h
e out
d
oor unit venti
l
ate
i
s
f
unctioning properl
y
Ensure the outdoor unit ventilation
is functioning properly
Is the heat exchanger dirt
y
?
Is the heat exchanger dirty ?
No
Clean the heat exchan
g
e
r
Clean the heat exchanger
Yes
Check whether the re
f
ri
g
erant
s
y
stem is
f
unctioning normall
y
Check whether the refrigerant
system is functioning normally
Re
pl
ace out
d
oor main
boar
d
. Has the
p
roblem been
res
o
lve
d
?
Replace outdoor main
board. Has the problem been
resolved?
No
I
f
the level o
f
re
f
ri
g
erant is not
s
u
cien
t
,
does the s
y
stem wor
k
a
f
ter re
f
rigerant is adde
d
?
If the level of refrigerant is not
sucient, does the system work
after refrigerant is added ?
No
Is the outdoor
f
an runnin
g
properl
y
?
Is the outdoor fan running
properly?
Please re
f
er to the solution o
f
the
"
f
an speed is operating outside o
f
the normal rang
e
"
ma
l
fu
ncti
on
.
Please refer to the solution of the
" fan speed is operating outside of
the normal range " malfunction.
No
Yes
No
C
o
rrect the c
o
nnecti
on
Correct the connectionNo
Yes
Yes
Is the connection between
temperature sensor and
PCB in working order?