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First thing to do? Is your incoming power correct?

For Spas operating on 115v, test Neutral + Black. You should have 110-120vac present. If not, the issue is incoming power to the spa.

For Spas operating on 230v, test Black + Red. You must have 220-240v present.

If so, test Neutral (white) + Black and Neutral + Red. You must have 110-115v.

Lastly test Neutral to Ground. You should have less that 10v present if any.