How to Fix the Sundance Spa "Watchdog

How to Fix the Sundance Spa "Watchdog" Error

If your Sundance Spa control panel is displaying four dots (...) or a flashing Watchdog icon, your spa has entered a safety lockout mode. This is usually caused by one of three things: a dirty filter, a failed temperature sensor, or a dead circulation pump.

Common Causes of the Watchdog Lockout

  • Air Lock: Usually happens right after a water change.
  • Failed Circulation Pump: If the water isn't moving, the heater gets too hot, triggering the Watchdog.
  • Bad Temperature Sensor: The "brain" thinks the water is 131°F and shuts down to prevent scalding.

Pro Tip: The "Hum" Test

Go to your spa's equipment bay. If you hear a faint humming noise but no water is moving in the footwell, your Sundance circulation pump is likely seized. Replacing this pump is the most common fix for a recurring Watchdog error.

Shop Replacement Sundance Pumps Here →

How to Reset the Error

  1. Turn off the main GFCI breaker for 30 seconds.
  2. Remove your filters (to rule out a flow restriction).
  3. Turn the breaker back on.
  4. If the dots return immediately, your sensor is bad. If they return after a few minutes, your pump is bad.
Feb 5th 2026 SpaStore.com

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