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Hi All - just purchased a cal spas spa about 3 months ago. I wished I found this forum for water quality a while ago. I figured that out well at least until I had my problem with a heater sensor wire melting. In any case I look forward to learning.

I have a 3 month old cal spa. Tripped breaker. Opened panel to find wire melted on heater sensor. Image attached. Looking for advice on what would cause it. No water in area, no wiring issue. Just an odd case. I wonder if the circuit board could have caused it or is it the heater and/or sensor?