Jacuzzi J345 (2207) Error Sn1: Replace Hi-Limit Sensor OR Clean up Calcium Deposits

Hey ya'll:

I'm trying to fix a Sn1 Error on a Jacuzzi J345 hot tub (2007) that came with the house I purchased.

I believe I have mistakenly replaced the temperature control sensor in attempt to fix the tub; a new one has been installed properly. (Once it was installed, I turned on the breaker, and the readout on the control panel still read Sn1)

I'm trying to determine if the issue I'm having to resolve next is

1. Replace the Hi-Limit Sensor attached to the control board and associated pipe

-or-

2. Should I do a deep clean of the calcium deposits all around the internal area?

Thank you for your advice!

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