Alde not working

Without systematic diagnosis, this can be a wild goose chase. T@Balong, please confirm the following details just to make sure I understand everything correctly:

• On battery and propane the Alde works normally.
• On shore power with the battery OFF, the Alde does not work at all on either electricity or propane. It makes no sounds (clicks, whirrs, etc.) when you turn it on.
• On shore power with the battery OFF, all other 12V devices (lights, water pump, fan, etc.) work normally. I.e., only the Alde doesn't work. 

Got it. Regardless of the fuel source, the Alde requires 12VDC for the electronics to work. This can come from either the battery or the converter (when hooked up to shore power).

That the Alde works on battery suggests that the Alde itself is fine, as is the circuit connecting the Alde to the WFCO power center (usually called the "converter" but the converter is only one component of the power center). This includes all the fuses as well (which you have already checked).

That all other 12VDC devices (lights, etc) work when on shore power suggests that the converter itself is fine.

That the Alde doesn't work AT ALL on shore power with the battery disconnected suggests that the Alde 12VDC power circuit is not getting power from the converter.

This would be a very odd circumstance, but could derive from a broken or loose connection internal to the power center. Unfortunately, tracking that down or even suggesting where to look is outside the scope of my experience. Good luck and let us know when and if you get it sorted.