Sn2
Sunrise Spas
High-Limit Sensor Failure
Display shows Sn2 or SN2, spa may overheat or not heat
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted high-limit sensor, Loose sensor in heater manifold, Corroded connector at control board, Overheated heater tube causing sensor damage
How to Fix / Troubleshooting
Safety first: Shut off power at the GFCI and allow the spa to cool.
- Locate high-limit sensor: It is usually mounted on or near the heater manifold, separate from the main temperature sensor.
- Check mounting: Ensure the sensor is fully seated in its well or clamped securely to the heater tube for accurate readings.
- Inspect wiring: Follow the sensor lead to the control pack and check for loose or corroded connections. Clean and reconnect.
- Replace if needed: If Sn2 persists after reset, replace the high-limit sensor with a Sunrise Spas-compatible part. If the heater tube shows signs of overheating, have a technician test the heater and relays.
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Repair Difficulty
Medium
3/5
Required Part
High Limit Temperature Sensor
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