Error Code
SN1 error code — Hot Spring / Watkins spa
Always cut power at the breaker before opening the spa pack or touching wiring. Spa equipment runs at 120/240V and can be lethal. If you are unsure, hire a licensed spa technician.
SN1 here mirrors Balboa's: a hard electrical failure of the hi-limit sensor circuit. Harness first, then the sensor.
What SN1 means
Temperature sensor problem — open or short.
Diagnose in order
- Power-cycle once
- Inspect harness and connections
- Replace the hi-limit sensor in the heater
Likely failed parts
Frequently asked questions
Related codes & guides
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