OP. - I would reach out to MasterVolt directly if you have not already done so. They have been in the marine power business for a long time and will have tech resources in Florida.
This is a data buss operated system so it may require specialized knowledge and tools like a data buss reader to properly troubleshoot.
We love our Tellaro 20AT and wish you all the best in getting this issue resolved in a timely fashion.
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