Carrier 25HHA4 - Troubleshooting (Cont.); Water-Level Alarm Diagnosis

22
3 --- W a t e r --- l e v e l a l a r m --- d i a g n o s i s a n d s o l u t i o n
Error Code E8
Malfunction conditions If the sampling voltage is not 5V, the LED displays the failure.
Possible Causes
• Wiring mistake
• Water--- level switch faulty
•Waterpumpfaulty
• Indoor PCB faulty
I
f
t
h
e wate
r
-
l
eve
l
sw
i
tc
h
is
i
nserte
d
we
ll
?
If the water-level switch
is inserted well?
No
I
nsert t
h
e wate
r
-
l
eve
l
sw
i
tc
h
we
ll
Insert the water-level switch well
I
f
t
h
e wate
r
-
l
eve
l
sw
i
tc
h
is
b
ro
k
en
?
If the water-level switch
is broken?
Yes
R
e
pl
ace t
h
e wate
r
-
l
eve
l
sw
i
tc
h
Replace the water-level switch
R
ep
l
ac
e
t
he
water
p
u
mp
,
I
f
mal
f
unctio
n
is
s
t
ill
not
so
l
ve
d
Replace the water pump, If
malfunction is still not
solved
Yes
No
Yes
R
eplace the indoor main P
C
B
Replace the indoor main PCB
Power o
ff
,
t
h
en restart t
h
e un
i
t
2
m
i
nut
e
s
l
ate
r
.
I
s
i
t st
ill
di
sp
l
ay
i
ng t
h
e error co
de
?
Power off, then restart the unit 2 minutes
later. Is it still displaying the error code?
Yes
ADDITIONAL INFORMATION FOR CRITICAL PARTS:
Temperature sensor troubleshooting
Disconnect the temperature sensor from the PCB, and measure the resistance value with a multimeter.
Temperature sensors:
1. Room temperature (T1) sensor,
2. Indoor coil temperature (T2) sensor,
3. Outdoor coil temperature (T3) sensor,
4. Outdoor ambient temperature (T4) sensor,
5. Compressor discharge temperature (T5) sensor
Indoor Fan Motor
Measure the resistance value of each winding by using the multimeter.