3 wire pressure switch question

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I have extensive experience in HVAC service work and a friend asked me to look at his pool heat pump that wasn’t working. His controller on the heat pump is displaying a refrigerant high pressure lock out. The pressures are fine so I was trying to check his pressure switch but the fact it is a three wire switch running to the controller has me confused.

On the controller it has common, normally open, and normally closed. The controller has 24v on both the normally open and the normally closed terminals. I don’t know what right looks like and can’t find a wiring schematic for his pool heater (the model and serial name plate is nowhere to be found).

Can someone please let me know if the voltage readings are normal? Or, even better, how that 3-wire pressure switch works. On our HVAC equipment we have 2 wire switches that simply open on pressure rise, but these 3-wire switches have me confused.