This is the FOURTH spa pack, same brand, that i have had to buy in 12 years. Every pack failed the same way, a bad relay that self-corroded. I had the wiring from the house re-installed and inspected, not, it's just an expensive disposible part, and I'd like to go with another brand, but my whole tub is set for this one, it would be a nightmare to try and re-work it. so if you have one of these, find an electronics guy that can diagnose that relay, and just have it as a spare. Spending thousands on these is annoying. (They did ship it quickly though, no complaints with the customer service).