Another scenario in pump failure is where stagnant water inside an overheating block starts to soften and possibly melt the tubing connecting to the block. The CPU may cope for a while, but some people have found that their mobo got a sudden bath. Best to have as many failsafes as possible. The circuit I'm putting in has the option of fitting a leak detector as well.
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"There is a thin line between magic and madness"
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