Carrier 38VMA Series Service Manual page 65

Caution:
Turn off the power switch before connecting or disconnecting the connector. Failure to do so could damage
the board.
Switch on the power to check
whether the fan begin to run or not. Check to see if the
red indicator LED2 of fan board is
lighted up or not
NO
After the fan runs for
YES
Replace the
ten seconds, check
Power circuit of
whether the red
fan board
indicator LED2 of fan
board is lighted or not
NO
After the fan runs for
thirty seconds to one
minute, check
whether the red
indicator LED2 of fan
board is lighted and
there is fault P9
NO
6
P
NO
YES
Normal
5
4
3
1
2
N
YES
Replace the
fan board
Switch on the power
to check whether the fan
begins to run. See if the red
indicator LED2 of fan board is
lighted or not
Replace the
Main board
1.
2.
3.
4.
5.
6.
* The normal value of output voltage
between P and N terminal on fan module is
DC 650V for 460V ODU.
YES
Replace
the motor
Power supply indicator lamp
Fan motor U, V, W output port
Error indicating lamp
PCB control signal input port
Program input port
Switching power DC power input
65