"jthread" writes:

Anyone have experience with pressure switches?

Mine has malfunctioned twice in one year. I just looked it up and it's $52.
This can get old real fast.

No experience with pressure switches other than the fact that I replaced
one in my pool heater when it started leaking.

My experience with pool heaters is that all the parts wear out and it
doesn't take long before you have to replace the whole thing.

I've replaced most of the parts and last year so many major parts were
worn out or rusted out, I had to replace the whole thing. Apparently
the combination of heat, water, and being outdoors all winter is
pretty hard on them.

Never had a $52 repair. All my repairs were way over that.
Make sure to keep the PH near neutral.