after 5 month's the unit randomly started smoking and threw an F04 error code.

After storms and power loss, in two separate events, each BX1000M (I had purchased two at the same time) failed with the F04 error code which is a "Clamp Short" and requires replacement

F04 and F06 errors, constant alarm, looks to be DOA

F04 error code

F04 error code indicates a clamp short - meaning either a manufacturing or design defect which is non repairable