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Display temp incorrect after powering back on post hurricane RHEEM 8350

Hi. We turned off our pool / spa heat pump during the hurricane. We have power back. Turned it back on via the breaker. The temp says 58 when it's really 87 in the pool water.
The heater works fine , we turned on the spa. 75 really equaled 102ish - our normal spa temp. 

I have searched and searched all the manuals, nothing discusses the MENU options after selecting SET button for 5 seconds.

Can someone tell me what to do to correct the display to real temp please?
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