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SN1

Sundance Hot Tub

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

Sundance Spa SN1 Error — High Limit Sensor Fault

What Does This Error Mean?

SN1 on a Sundance spa indicates a high limit sensor fault — the safety sensor that prevents overheat is reading out of range.
The control system disables heating to prevent uncontrolled temperature.
This is a sensor replacement repair (50–120 USD part).
Most Sundance dealers can fix SN1 in one service visit.
Don't bypass — high limit safety is required.

Affected Models

  • Sundance Optima
  • Sundance Cameo
  • Sundance Maxxus
  • Sundance Constance
  • Sundance Capri

Common Causes

  • High limit sensor failed (thermistor open or shorted)
  • Sensor wire damaged or disconnected
  • Sensor coated with heavy calcium buildup
  • Connector loose at the controller
  • Controller sensor input damaged

How to Fix It

  1. Power off at the breaker.

    Switch the spa's GFCI breaker off.
    Wait 60 seconds for capacitors to discharge.
    Don't try to access sensors with the system live.

  2. Find the spa's equipment area.

    Sundance spas typically have access panels on the side — usually opposite the steps.
    Open the panel to expose the equipment compartment.
    The control pack and sensors are visible inside.

  3. Inspect the high limit sensor.

    The high limit sensor is on the heater assembly — a thin probe inserted into the heater body.
    Two wires run to the control pack.
    Look for visible damage — burned spots, corrosion, or melted insulation.

  4. Check the wiring path.

    Trace the sensor wires from sensor to the control pack.
    Look for chafe damage, kinks, or breaks in the insulation.
    Wires routed through tight spaces in the cabinet sometimes wear over years.
    Replace damaged wires before assuming sensor failure.

  5. Schedule service for sensor replacement.

    If wiring looks fine but SN1 persists, the sensor itself needs replacement.
    Sundance dealers stock OEM sensors specific to your model.
    Cost: 80–150 USD for sensor + 1 hour labor.
    OEM is recommended over generic — Sundance controllers are tuned to specific sensor characteristics.

Frequently Asked Questions

Can SN1 come back after replacement?

If the issue is upstream (controller failure, wiring damage), yes.
The dealer's first replacement attempt should rule out controller and wiring issues.
If SN1 returns within days, the controller may need replacement (300–700 USD), which for older spas approaches the cost of a full upgrade.

Will the spa heat with SN1 active?

No — Sundance disables heating when SN1 is active for safety.
Without working high limit protection, an overheat event could go unchecked.
The protection is doing its job correctly.
Don't try to bypass — fix the sensor.