Water sw open - Rheem Heater

I am suspicious the water pressure switch is going bad. The story: I installed a new vs pump this year, the 7 year old rheem heater worked fine for the first 2 months. I found a low speed that satisfied the heater and it ran fine at this low speed, 11 gpm. Last week I found the error message water sw open, kicked the flow to 15 gpm and it ran fine. Kicked back down to 11gpm and it shut down, water sw open message. Today I had it running at 15 gpm and got the error message. The heater...

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