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My Pentair heater started up just fine with our recent spring pool opening and is functional. However, it is intermittently switching itself to the Spa mode (even though I cannot do that myself manually on the membrane pad). And when it does so, I cannot even change the temperature (or tell what...

I have a Mastertemp 250 as well that is automatically switching from pool mode to spa mode on its own (even though I cannot do that manually). And I cannot change temperature on spa mode to keep it from heating when it does this. I shut it off on the membrane pad and it actually turned itself on...