I have a multiplus compact hooked up with AC in and out and DC connected on the negative side but through a shutoff switch to the batteries. The switch is kept at off at the moment (awaiting parts to be able to program multiplus for charging lithium batteries).
I have lost AC to the boat (via Multiplus) with a red alarm LED on steadily and no other lights. Turning it off, pausing, then back on results in the same condition.
When I look this up in the manual, it says "Check the table for the appropriate course of action".
What the heck table are they talking about? I need AC on the boat as it is being refit. Should I just dump the pass-through AC and split it so it runs to both the boat and the charger? I don't want the shore power to the boat to depend on a functioning battery charger. That seems dumb.