Sn3
Vita Spa
Auxiliary Sensor / Ambient Sensor Fault
Display shows Sn3 or SN3; spa may operate but temperature control is unreliable or heater cycles erratically.
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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
Failed ambient or cabinet temperature sensor, Damaged sensor harness, Incorrect sensor type installed
How to Fix / Troubleshooting
Safety: Disconnect power before accessing the control pack.
- Step 1 – Identify sensor: Refer to the Vita Spa wiring diagram to locate the Sn3-designated sensor (often ambient or auxiliary).
- Step 2 – Inspect harness: Check for rodent damage, pinched wires, or moisture intrusion along the sensor cable.
- Step 3 – Test sensor: Measure resistance and compare to the manufacturer’s chart. Replace if out of spec.
- Step 4 – Replace with correct part: Ensure you use the correct Vita Spa auxiliary sensor part number; mixing sensor types can cause persistent Sn3 errors.
- Step 5 – Control pack evaluation: If Sn3 persists with a known-good sensor, the control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Ambient Temperature Sensor
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