On Rheem gas fired pool heaters SNS is a temp sensor failure.
1. Water temperature is below 36F or above 110F
2. If the two thermistors are more than 2 degrees apart, the SNS code will appear.
3. Loose or corroded connection at P1.
4. If the sensor is not mounted all the way into the JACO fitting on the header, it may give a false reading.
SOURCE: Rheem Pool Heater: P-M406A-EN-C Can't
SNS - off signals that a sensor is not functioning. In your model it's most likely the temperature sensor - it will have to be replaced and that is a job for the Rheem authorized service shop.
You can find the closest to your location here
http://www.rheem.com/Contractors.aspx?postalCode=
If you prefer to deal with Rheem directly then send them a message using this
http://www.rheem.com/Contact.aspx
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