Troubleshooting Common Issues | Discover Energy Systems

Problem	Plausible Fault	Corrective Action
Amber light is flashing (this is just a warning)	These are self-correcting, low priority warnings.	To identify the cause and perform the corrective action, refer the AES Cabinet Faults and Warnings. Connect your computer to LYNK II and start LYNK ACCESS software to identify the warning.
Amber light is solid	Manual intervention is required.	Connect your computer to LYNK II and start LYNK ACCESS software to identify the fault. To identify the cause and perform the corrective action, refer the AES Cabinet Faults and Warnings. Critical faults require restarting the battery after identifying and resolving the issue.
Pre-charge fault	Steps in the startup procedure were out of order.	Start up the AES Cabinet as specified. Refer to STARTUP AND SHUTDOWN PROCEDURE.
Battery door is open fault	The cabinet door is open.	Close the battery compartment door.
Battery door is open fault	The door sensor bracket is bent or is not at the correct angle.	Inspect the mounting bracket to ensure it sits at a true 90° angle, allowing the switch to fully depress when the door is closed.
Closed-loop communication is not working	The AES Cabinet, through the LYNK II, is not communicating with the inverter.	Verify each cable is connected securely to the correct port. If using a manually crimped cable, it may be miswired or damaged. Ensure LYNK II and the inverter are configured correctly.
Battery has shut down	Immediate attention is required.	A critical fault is in effect and manual or power cycle reset is required. Check if the E-stop is engaged.ͬ Check if there is a failed contactor, or a blown fuse or MSD.ͬ If there was a long-term power outage and the battery is at 0% SOC, turn ON the battery only after turning ON the UPS and a charge source is available (e.g. PV solar, generator, or grid).
Temperature protection	Extreme temperatures, air circulation, or issues with the thermal management system.	Confirm environmental conditions are within acceptable ranges. Check and clean the vents, including the TMS door vent screen. Ensure there is airflow. ͬ Clean fans and replace if they have failed. Confirm operation of the TMS and other parts of the cooling system.
Cannot connect to LYNK Cloud	A firewall or other communication issue is preventing connection with the server.	Verify the network allows outbound internet access and that the LYNK II can obtain its security certificate.
Unable to update the firmware on the LYNK II Gateway	LYNK ACCESS may be out of date or the LYNK II memory may be corrupted.	Download and install the latest version of LYNK ACCESS (http://discoverenergysys.com). If LYNK ACCESS indicates LYNK II memory is full, the memory may be corrupted. Contact technical support.
Large temperature variance between packs	The door was open while the AES Cabinet was in operation.	Run with the battery door closed to allow the TMS to balance the temperatures of battery packs.
Batteries won’t turn ON in the cold	The AES Cabinet was turned off for an extended period in a cold environment.	When a charge source is available, turn on the AES Cabinet so the TMS warms the battery packs.
MSD not installed fault	One or more MSDs are not installed properly.	Confirm MSDs are securely installed. Refer to Removing and Replacing the TMS.
Battery at 0% SOC	The AES Cabinet was overdischarged and turned off for an extended period.	Verify power is supplied to the auxiliary input on the HVB (TMS/UPS) to power system controls. Start up the AES Cabinet when a charge source is available (e.g. PV solar, generator, or grid) to charge battery packs.
UPS Battery at 0%	The UPS batteries may be nearing end of life, the battery charger in the HVB has failed, or the AES Cabinet was operating without an auxiliary input source.	Power may not have been supplied to the auxiliary input on the HVB (TMS/UPS). After power is supplied to the auxiliary input for 12 hours, use UPS batteries to start up the AES Cabinet and verify the battery charger is functing properly.ͬ If the UPS batteries can run system control without auxiliary input for 1 to 2 hours, then the batteries are operational. (Typical UPS battery life expectancy is 5 years)