Hot Water tank not heating on R29

[Islander220]

I just relaunched my 2022 R29 after being on the hard for the winter and the hot water tank is not heating. Any suggestions on troubleshooting?
It was working fine last fall before I had it hauled out and winterized.

 

[zzr7ky]

On my Whale Seward 6 gallon there is a thermal reset button near where the wires enter the unit.

 

[Bosn Mate]

I would first see if all air is out of the lines; assume that they were drained for the winter. Fill the tank, then open the hot water faucets and ensure the air is out. Finally turn on the hot water heater.