My blower began to be intermittent. Clicking noises were heard. I pulled the ccu, and replaced the tiny fuse in the back. The ccu worked great for a day, and then died. I pulled the ccu and the tiny fuse was blown again.

What is this fuse for?

As a side note, I have the aux pump fused by a device provided by a member here, so thats off the table as an issue.