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Just a guess but I think the problem is in your 2nd picture with the L2 connection and only a few strands. When the 120v phase for L1 is "on" (like 1/60th of every second) the L2 connection may be seeing a load imbalance because it cannot return the same load to your electric service over those...

Wow, that 2nd picture shows the blue wire has backed out a lot from it's connection (notice the white and brown have the insulation inside the wire clamp / spade assembly. But that black wire may only have a couple of strands still attached to the pump. I'd redo at least about half of those...

linzjane88 I've been thinking of doing a similar DIY setup. The changes I would make to your example posted would be a layer of foil faced polyiso insulation below the PEX tubing and tempered glass instead of plexiglass cover. Of course that glass makes it very expensive (anyone let me know...