This is the total number of times your Wall Connector has had a thermal foldback event.
Thermal foldback limits the temperature to protect against failure by reducing the charging current.
Some events that can cause this are handle (40), input wiring (41), and PCB (42) over temperature when charging.
Wall Monitor is not affiliated with Tesla in any way. If you have any faults or issues with your Wall Connector you should contact Tesla's support or your installer.