Carrier 40MAQB12B--3 - Condenser High Temperature Protection Error Diagnosis (P5); P5 Condenser High Temperature Troubleshooting

62
P5 (High temperature protection of condenser) error diagnosis and
solution
Error Code P5
Malfunction decision conditions When outdoor pipe temperature is more than 149°F, the unit stops, and unit runs again when the
outdoor pipe temperature is less than 125°F.
Supposed causes
S The condenser temperature sensor faulty
S Heat exchanger dirty
S System block
Troubleshooting
H
i
g
h tem
p
erature
p
rotecon o
f
con
d
ense
r
High temperature protecon of
condenser
C
heck whether the
c
on
d
enser temperature
i
s
High
er
th
an
6
5
°C
Check whether the
condenser temperature is
Higher than
149
°F
Yes
Check whether the
resistance o
f
condenser
tem
p
.
sensor
i
s
n
orma
l
refer to the
Appendix
1
Check whether the
re
1
Check whether the
resistance of condenser
temp. sensor is normal
refer to the Appendix 1
R
epl
ace t
h
e tem
p
erature sensor
Replace the temperature sensor
No
No
C
heck whether the outdoo
r
am
b
i
ent tem
p
erature
i
s
high
er t
h
an
50
Check whether the outdoor
ambient temperature is
higher than 122 °F
No
Stop t
h
e uni
t
Stop the unit Yes
C
heck i
f
the outdoor unit
ven
l
aon is good
Check if the outdoor unit
venlaon is good
Yes
M
ak
e t
h
e out
d
oor un
i
t vent
il
ate we
ll
Make the outdoor unit ventilate well
C
heck whether the heat
e
xc
h
anger
i
s
di
rt
y
Check whether the heat
exchanger is dirty
No
C
lean the heat exchanger
Clean the heat exchangerYes
C
heck whether the re
f
ri
g
erant
sy
stem
i
s o
k
Check whether the refrigerant
system is ok
R
ep
l
ace out
d
oor ma
i
n
b
oar
d
Replace outdoor main
board
No
R
ef
ri
g
erant is not enou
g
h add the
r
e
f
rigerant
Refrigerant is not enough add the
refrigerant
No
C
heck i
f
the outdoor
f
an runs
p
ro
p
er
ly
Check if the outdoor fan runs
properly
please re
f
er to the soluon o
f
f
an
s
peed has been out o
f
control
mal
f
uncon
.
F
ind out t
h
e cause and
h
ave it so
l
ve
d
.
please refer to the soluon of fan
speed has been out of control
malfuncon . Find out the cause and
have it solved.
No
Yes
No
C
orrect t
h
e connecon
Correct the conneconNo
Yes
C
heck the connecon
b
etween temperature
s
ensor an
d
P
C
B
.
Check the connecon
between temperature
sensor and PCB.
Yes