Hi, when parked on my drive my alphard keeps letting off an alarm,  I phoned the guy we bought it off and he said just turn the fridge on as its an alarm saying the battery is on full charge. This is not an issue when camping but not ideal when parked up for a few weeks at a time. I thought I could turn off the switch on the ec155 attached photo but this didn't fix the problem. Any ideas please?

My EC155 is kaput, had it & wiring checked out by highly recommended local installer.

They recon there’s an internal fault.
It started emitting smoke when I tried boost leisure battery using standard charger fed from 13amp supply with ec155 switched off & its connection to battery off.