Modbus Communications Errors - The unit uses Modbus to communicate with the VFDs, gas heat modules, relief fans, and the optional power meter.
1. If the Symbio 800 controller is communicating to some Modbus devices, but not all, then there is most likely an issue with the harness or the Modbus device. If multiple devices are not communicating, check the harness for damage as it runs through the unit and verify plug connections. Inspect all plug connections for water intrusion and to verify that all pins and sockets in the plugs are fully inserted and making connection. If only one device is not communicating, run a dedicated comm wire to that device. If it still will not communicate, then there is an issue with the device. If it does communicate, then there is a harness problem.
2. If the Symbio 800 controller is not communicating with any of the Modbus devices, run a dedicated comm wire from the Modbus connector on the Symbio controller to any one of the Modbus devices. Disconnect the factory Modbus connection from both the Symbio 800 and the Modbus device. If communication is not restored, then there is an issue with the Symbio 800 controller. If communication is restored, then the Symbio 800 is good, and there is an issue with the Modbus cable. Check the harness for damage especially as it runs through the unit. Inspect all plug connections for water intrusion and to verify that all pins and sockets in the plugs are fully inserted and making connection. Also, separate the Modbus cable from the control power transformer as it exits the top of the control box.
Check out the attachment below (if download is not possible the preso is in image file format below)...this guide was created for the Runtest operators to assist in Modbus cable communication issues for IPAK3 products so it may not represent the particular unit you're working on completely but it may help with the layout.
Global Buss Communications Errors - The unit uses the Global bus to communicate with all the LLIDs in the unit.
1. If the Symbio 800 controller is communicating to some of the LLIDs, but not all, then there is most likely an issue with the harness, a power supply, or a particular LLID. If multiple devices are not communicating, check the harness for damage as it runs through the unit and verify plug connections. Inspect all plug connections for water intrusion and to verify that all pins and sockets in the plugs are fully inserted and making connection. Some LLIDs are powered from different power supplies than the Symbio 800 controller. Verify that all power supply modules are functioning. If only one device is not communicating, run a dedicated comm wire to that device. If it still will not communicate, then there is an issue with the device. If it does communicate, then there is a harness problem.
2. If the Symbio 800 controller is not communicating with any of the LLIDs, run a dedicated comm wire from the P3 Machine Bus connector (+ and -) on the Symbio controller to any one of the LLIDs. Disconnect the factory Global comm wires (+ and -) from both the Symbio 800 and the LLID. If communication is not restored, then there is an issue with the Symbio 800 controller. If communication is restored, then the Symbio 800 is good, and there is an issue with the Global bus cable. Check the harness for damage especially as it runs through the unit. Inspect all plug connections for water intrusion and to verify that all pins and sockets in the plugs are fully inserted and making connection. Also, separate the Global bus cable from the control power transformer as it exits the top of the control box.
Force Return to Factory Default (Using 999)
In some cases, a corrupt database or similar problem may prevent you from accessing the Tracer
Synchrony user interface in order to return the Symbio 800 controller to factory defaults.
If this occurs, do the following to return to factory defaults:
1. Save a Backup and download the latest firmware revision.
Power down the Symbio 800.
2. Reset the rotary switches to “999.”
3. Power up the Symbio 800.
The 7-segment display shows F, o, r, C, E.
4. Within 30 seconds, set the rotary switches to the intended normal value.
The 7-segment display shows C, L, E, A, r, indicating that the database is being cleared. It will
then resume normal operation showing –L on the 7-segment display during startup and then
“dancing dashes.”
Note: If rotary switches are not reset within 30 seconds, the Symbio 800 will power down
leaving the database intact.
5. Equipment operation can be restored after clearing with either Tracer TU or a backup file to
restore.
6. This procedure (999) will not clear the license file.
TU Communications Errors:
1. Verify that you have the most current version of TU installed.
2. Cycle power to the unit.
3. If TU still will not connect, try using the Symbio UI to see if it will communicate to the Symbio 800 controller
a. Close TU, but keep the USB cable connected.
b. Open a web browser.
c. Enter 198.80.18.1 in the address bar and press Enter. (No internet connection required)
d. If it communicates the Symbio 800 controller is good. You can finish your setup with Symbio UI (unless changing configuration) or close the Symbio UI and try TU again. If TU still will not communicate, there may be an issue with TU.
e. If it will not communicate using the Symbio UI, try rebooting the PC, using a different USB cable and USB port on the laptop, and another laptop.
f. Replace the Symbio 800 controller if none of these steps work.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.