Carrier 38LUVH025N Service Manual page 38

9.2.3 E2(zero-crossing signal error) diagnosis and solution
Is power supply and
connection
connectors good?
9.2.4 E3(indoor fan speed out of control) diagnosis and solution
Is the indoor fan
motor connector and
connection good?
Is voltage
applied to the fan
motor?
(rang
between mid pin and
N on CN1
9.2.5 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
Is the
temperature
connector
connection good?
Replace the sensor
and check
display again?
of
YES
YES
being
90v-160v
NO
outdoor
sensor
and
YES
if E5
NO
NO
YES
NO
YES
35
Be sure the power supply
is good and correct the
connection
Indoor PCB is defective.
Replace the indoor PCB.
Repair the connector
and reconnect
Indoor PCB
defective. Replace the
indoor PCB.
Replace the indoor fan
motor
Repair the connector
and reconnect
Replace outdoor
e-box
is