Carrier 38MBRC Series - CONDENSER HIGH TEMPERATURE PROTECTION DIAGNOSIS; PC 0 A Troubleshooting

38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
29
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?