Display shows Sn3 or SN3, temperature reading is erratic

Safety first: Turn off power at the GFCI.

• Identify sensor: Some Sunrise Spas models use an additional sensor for freeze protection or cabinet temperature. Locate it inside the equipment bay or attached to plumbing.
• Inspect for damage: Check the sensor body and cable for cracks, cuts, or signs of water ingress.
• Dry and reconnect: If moisture is present, dry the connector and surrounding area thoroughly, then reconnect firmly.
• Replace sensor: If Sn3 remains after reset, replace the auxiliary sensor with the correct Sunrise Spas part number.