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There is also a hi limit temperature probe that will shut down the heater if the temperature exceeds a certain temp (150 in my case), which will happen pretty quick if the water isn't flowing. So even if the water pressure sensor fails, there's some additional insurance against total meltdown...

I bought a home a couple years ago and it came with an in-ground spa with a Minimax 400 Plus heater. Owning this has been like owning an old car. Every time I fix one thing, something else breaks! It started with gas line that took on water due to corrosion. I suspect the water in the...