a/c disconnect box failure?
Two years ago I had a company install a Sanyo min-split a/c unit for our basement. It’s a small one operating on 120v (larger ones operate on 220). On Saturday the unit was working fine and then stopped at some point. Checked breaker panel, nothing tripped. Checked batteries on remote, they work. Went outside and looked at compressor unit. Was going to check for voltage reading and opened up the disconnect box. The attached picture is what I found. The terminal used for the connection of the white wires is completey charred. The plastic cover melted.
Anyone have thoughts on how this could have happened? I thought a breaker was supposed to stop this from occuring. I’ve called my electrician. Will also call my HVAC company.
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Loose connection generates heat, heat warps terminals, connection broken-no power.
Either vibration loosened the connections over time(if that's the case I would tend to think the rest would be loose also), or it wasn't correct to start with. Or both!