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LED OPL and UniLinc Troubleshooting
76. Fan Motor Centrifugal Switch Error
UniLinc Error Display: Fan Motor Centrifugal Switch Error
LED OPL Error Display: E FnCs
Is there 24 volts AC
at H6-1 to H6-9?
Is there 24 volts AC
at H2-10 to H6-9?
Check Transformer
and Fuse F3.
Replace
I/O Board (AP1).
Check harness and
wire connections at
the motor. Repair or
replace as necessary.
No
Yes
Yes
Yes
Yes
No
Is there 24 volts AC at
H2-3 to H6-9 with fan
motor running?
No
Check control harness
H3 and I/O Board (AP1).
Replace as required.
No
(1)
(2)
(3)
(4)
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
NOTE: The following checks are DC
voltage checks.
Replace front-end
control (AP2.)
NOTE: Before performing these checks, the airflow switch must be pulled in, the fan motor contactor
must be closed, and the motor must be running.
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