Hot Tub Control Panel Is Flashing or Showing Dashes

Direct answer

A flashing indicator or a row of dashes is a brand-specific message, not a single industry code. On the 2006 Sundance 680 Series, panel dashes (- - -) mean the safety Watchdog software has been triggered and the spa is deactivated; the manual directs owners to contact an authorized Sundance dealer (Sundance 680 Series owner’s manual). On Limelight Hot Spring spas, a flashing Power indicator means the heater high-limit thermostat has tripped (Hot Spring Limelight owner’s manual). Confirm the exact pattern in your own manual before taking any next step.

Safety note

Do not enter the spa if the panel is warning about overheating, Watchdog lockout, or another high-temperature condition. Jacuzzi’s consumer error-code article tells owners who see dashes not to use the spa, to secure the cover so others do not try to use it, and to call a service technician (Jacuzzi). Do not open the control box. Do not bypass sensors or safety software. Do not keep power-cycling a spa that immediately returns to dashes or a hard lockout.

Match the pattern before you name the fault

Write down exactly what you see:

• Solid temperature vs. letters such as OH
• Flashing Power, Ready, or other status icons
• One dash, three dashes, four dashes, or mixed symbols
• Any red safety lights named in your manual

Then open your brand’s error or troubleshooting section. Related TubWise pages for specific overheat messages include Sundance OH Error Code and Jacuzzi OH Error Code. Those pages do not redefine every dash pattern for every spa.

Sundance Watchdog dashes (scoped example)

For the Sundance 680 Series owner’s manual, section 13.8 states that when the panel displays - - -, the safety Watchdog software has been triggered and the spa is deactivated because a problem was detected that could damage the spa or its components. The stated action is to contact your authorized Sundance dealer (Sundance 680 Series owner’s manual).

That definition applies to that manual’s 680 Series coverage. Other Sundance years, controller families, or brands can use different dash layouts or different words for the same-looking display. Do not treat 680 Series Watchdog text as a universal spa rule.

The same 680 Series manual lists a separate OH overheat message when water temperature reaches documented high limits (Sundance 680 Series owner’s manual). Dashes and OH are related safety themes, not interchangeable codes.

Hot Spring flashing Power or Ready indicators (scoped example)

Hot Spring Limelight manuals give the Power indicator a diagnostic role: a flashing Power icon indicates that the heater high-limit has tripped because spa water is above the acceptable range or a malfunction such as low circulation from clogged filters has occurred (Hot Spring Limelight owner’s manual). Hot Spring’s consumer chart matches that idea: disconnect power for about 30 seconds to reset the heater high-limit, check clogged filters, and call for service if the thermostat continues to trip (Hot Spring).

A flashing Ready indicator on those Limelight controls is documented as a temperature-sensor problem. The charted step is to disconnect power for about 30 seconds, then call for service if blinking continues (Hot Spring; Hot Spring Limelight owner’s manual).

The Limelight lock icon for Spa Lock or Temperature Lock is documented as a non-flashing indicator (Hot Spring Limelight owner’s manual). A lock symbol is not the same signal as a flashing Power light.

Recurring high-limit shutdowns after the allowed reset path belong under Why Does My Hot Tub Keep Turning Off?.

Jacuzzi consumer guidance on dashes

Jacuzzi’s Hot Tub Lingo article tells owners who see dashes on the control panel not to attempt to use the spa, notes that the condition may relate to dangerously hot water and a high-temperature lockout, and links that situation to Watchdog software that can deactivate the spa and flash red safety lights as a warning. It tells owners to secure the cover and call a hot tub service technician (Jacuzzi).

Use that page as general Jacuzzi consumer caution. Still confirm the exact code table in your Jacuzzi model manual, because marketing articles are not a substitute for the spa-specific error list.

What flashing or dashes do not prove by themselves

• They do not identify which part failed
• They do not authorize jumping sensors, clearing Watchdog with unauthorized board procedures, or opening the control pack
• They do not mean every brand uses the same dash definition

If the panel is dark with no symbols at all, start with Hot Tub Display Is Blank but the Breaker Is On. If buttons ignore presses while a normal display remains, see Why Are My Hot Tub Buttons Not Responding?.

Safe homeowner steps

1. Do not enter the water while a high-temperature or Watchdog-style warning is active (Jacuzzi; Sundance 680 Series owner’s manual context).
2. Photograph or write the exact display.
3. Look up that exact message in your owner’s manual.
4. Follow only the reset or cool-down steps printed for your spa. For Hot Spring high-limit blinking, that may include a short power disconnect and a filter check (Hot Spring).
5. Call the dealer or technician named in your manual when Watchdog dashes, repeating high-limit trips, or unresolved sensor blinking remain.

When to stop and call a technician

• Your manual names dealer service for Watchdog or an equivalent lockout
• Dashes or flashing return immediately after the manual’s allowed reset
• Water temperature feels unsafe or the cover must stay secured per manufacturer warning
• You cannot match the display to any entry in your manual
• Further diagnosis would require control-box work or sensor replacement