USER MANUAL | NOVA OCUs
25
9.
Troubleshooting
If your NOVA OCU fails to operate following a standard start-up procedure, utilize the troubleshooting sequence provided below
to identify the issue and implement necessary corrective measures. Should additional assistance be required, do not hesitate to
reach out to your nearest Hetronic dealer for further guidance.
PROBLEM PROBABLE CAUSE CORRECTION
OCU won’t start
Incorrect Access code
(if enabled)
Enter correct access code
Battery fully discharged Replace with fully charged battery if needed
The OCU is turned ON, but
does not transmit –
Power/Green LED not
flashing
Battery is discharged Replace battery with a fully charged battery
Component failure
Contact your supervisor or nearest Hetronic
Service Centre
OCU is transmitting (Power
LED flashing), but machine
will not respond
No power to the MCU
Check the diagnostic LEDs in the MCU to be
sure power is applied. Ensure that the
system is properly grounded
OCU/MCU frequency
do not match
Follow instructions under “Frequency
Channel and Scan-Group configuration” or
contact your supervisor
OCU out of range
Take the OCU back into the range of the
MCU, press START
MCU powered off Turn ON power to MCU
Blown fuse in MCU Check all fuses and replace if needed. Make
sure you identify the cause for blown fuse(s)
before powering on the MCU again.
STOP failure in MCU. Red
STOP LED on PC board is
illuminated
Contact your supervisor
Battery Status indicator is not
displayed or is not updating
Loose or disconnected I2C
cable inside OCU
Open OCU and check I2C connection.
All machine motions operate
intermittently
MCU antenna connection is
loose or missing
Tighten or replace antenna
External antenna (if used) has
loose connection, poor
grounding or interference
Tighten antenna and ground connection.
Contact Hetronic or your Dealer for more
information
Connector inside MCU is loose
Check all connectors, reseat if needed
Another frequency may be
interfering with the system
Contact your supervisor
Table 3. Troubleshooting tips
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