© 2022 Staheli West
162
Faults
Fault 233: Generator Modbus Signal Failure
Indicates that communication between the PLC and the generator controller has been lost.
Causes
Troubleshooting
Fixes
• Modbus cable is unplugged.
• Port 2 on the PLC, Port J6 on
the generator controller, and
the modbus cable on top of the
burner controller are 3 locations
to check.
• 2017 and newer machines:
Unplug burner controller modbus
plug and generator modbus
plug one at a time to determine
whether it is fault 225 or fault
233.
• Inspect for secure connection.
• Damaged modbus cable / cable
ends.
• Check the entire modbus cable
path.
• Replace/Re-land cable or the
cable ends.
• A Short in the PLC Port 2 DB9
cable end.
• Disassemble the DB9 Cable
end and inspect for isolation/
grounding.
• Replace cable between PLC and
burner controller.
• Generator controller is not
programmed.
• Check to see if the controller has been programmed by:
1. Press “OFF” on the generator controller.
2. Press “Enter”.
3. Select “Device Info.” from the list.
4. Select “About TG410”.
5. Confirm that the ID is “Staheli 3.1” or higher.
*If the ID is not “Staheli 3.1” or higher, the controller needs to be
programmed by a dealer.
• Program version 3.X installed on
a 2016 or older machine.
• Check version in Menu >
Information.
• Install correct version.
2.X for 2016 and older
machines.
3.X for 2017 and newer
machines.
Fault 234: Generator Started Manually from Generator Controller
Indicates that the generator was started manually from the generator controller.
• The generator will not shut off during a normal shutdown.
• The generator will either need to be manually shutoff at the generator controller or it can be shutoff in
Menu > Diagnostics > Generator Status and pressing “Generator Reset”.
