Carrier 42LUVH025N - Page 37

35
9.2.4 E3(indoor fan speed out of control) diagnosis and solution
9.2.5 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
9.2.6 E6(open or short circuit of room or evaporator temperature sensor) diagnosis and solution.
9.2.7 P0(IGBT over-strong current protection) diagnosis and solution.
Is all connections on
PCB and between
Repair or correct the
connector or
Replace the outdoor
PCB and then
NO
YES
Check the compressor
NO
Is the indoor
temperature and
evaporator sensor
Repair the connector
and reconnect
Replace the sensor
and check if E6
NO
YES
Replace the.indoor
PCB
YES
Is the outdoor
temperature sensor
Repair the connector
and reconnect
Replace the sensor
and check if E5
NO
YES
Replace outdoor
e box
YES
Is the indoor fan
motor connector and
Repair the connector
and reconnect
Is voltage being
applied to the fan
motor?
NO
YES
Indoor PCB is
defective Replace the
YES
Replace the indoor fan
motor
NO