Panel not Signalling

Panel cell phone test trouble, Any trouble shooting tips?

Since it looks like it has been out despite having a recent high signal strength, I would first power down the system completely, unplug transformer first, then internal battery, then check the antenna and its connection to the module. Ensure it is snapped down securely.

Wait a couple minutes, then power the panel back up battery first, then transformer.

Wait a few minutes, then try a cell phone test. Any luck?