Display shows SN2 or SENS2, spa may shut down heating or run with limited functions.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off power at the GFCI breaker before working on sensors or the control pack.
- Identify secondary sensor: On Clearwater Spas, the high-limit or secondary sensor is typically mounted on or near the heater manifold separate from the primary sensor.
- Check connection: Unplug and re-seat the secondary sensor connector on the control board. Ensure it is in the correct labeled port.
- Inspect wiring: Look for damage along the sensor cable and ensure it is not routed near high-voltage terminals that could cause interference.
- Power cycle: Restore power and observe whether SN2 clears. If it reappears, the sensor is likely faulty.
Because the high-limit sensor is a safety device, replacement should use an OEM or Clearwater-compatible part. If unsure, consult a spa technician.
Repair Difficulty
Required Part
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