Sundance OH Error Code: Water Too Hot

Exact scoped meaning

In the cited Sundance 680 Series owner’s manual Error Conditions section (Panel Displays OH), the message means water temperature is above acceptable limits. That entry warns of hyperthermia risk and states:

DO NOT ENTER SPA!

In that same 680 Series OH entry, water temperature has reached 112°F (44°C) and the low speed pump has activated to circulate water through the heater.

This is the Sundance OH definition for that 680 Series manual text only. It is not Jacuzzi OH, Gecko OH, or a Watchdog dash display. Do not treat 112°F (44°C) as a universal hot-tub overheat limit.

Scope warning

Use this article only if your spa is covered by the cited Sundance 680 Series manual and your panel shows OH with matching overheat wording. Other Sundance series or newer manuals may use different overheat messages or different thresholds.

Confirm the exact OH (or overheat) text in your Sundance owner’s manual before acting. If your manual does not list OH this way, follow your manual instead of this page.

What the code can indicate

In the cited 680 Series OH entry, the control system is reporting that spa water is too hot relative to that manual’s limit. It is a safety condition, not a diagnosis of one failed part.

Do not treat OH as proof of a bad sensor, bad heater, or bad board. Sensor and board diagnosis is technician work.

For general heating behavior after the spa is safe again, see Hot Tub Not Heating: What to Check First. Refill situations are separate: Hot Tub Not Heating After a Refill.

Safe owner-level checks

First: do not enter the water while OH is displayed, as the cited 680 Series manual requires.

Then:

1. Keep people and pets out of the spa until the overheat message is cleared and the water is at a safe temperature per your manual.
2. Allow the spa to cool as that OH entry describes. In the cited 680 Series OH text, the low speed pump is already activated to circulate water through the heater. That entry does not list cover removal, ice, chemicals, or a specific resume temperature. Do not add cooling methods your manual does not print.
3. Do not keep using the spa while OH is active.
4. Contact an authorized Sundance dealer if the condition persists or if your manual directs dealer service for ongoing overheat.

If a different Sundance manual you own lists additional owner cooling steps for OH, follow that manual’s wording only for that spa. Do not import those steps into a 680 Series spa whose OH entry does not include them.

What not to do

Do not enter the spa. Do not add ice, cold water, or chemicals to force cooling. Do not bypass a high-limit device. Do not open the control box. Do not measure sensors with a meter. Do not apply Jacuzzi OH or Gecko OH temperature numbers to a Sundance 680 Series spa. Do not repeatedly reset the breaker to clear OH. Do not assume one part failed from the code alone.

When to stop and call a technician

Contact an authorized Sundance dealer or qualified technician if:

• OH returns after the water has cooled, or the condition persists
• the panel shows Watchdog dashes or another overheat shutdown that deactivates the spa (see Hot Tub Control Panel Is Flashing or Showing Dashes for how that differs from OH)
• a GFCI or breaker trips, will not reset, or trips again after one reset
• you smell burning, see scorching, damaged wiring, or leaks near electrical equipment
• diagnosis would require sensor testing or opening an electrical enclosure
• you cannot confirm your manual’s OH scope or thresholds

How to confirm the code in the owner’s manual

1. Identify your Sundance series and model.
2. Open Error Conditions / Error Messages for Panel Displays OH.
3. Match OH on the panel to that entry, including any DO NOT ENTER wording and temperature figures.
4. Follow only the owner actions listed for your manual revision.
5. Treat Jacuzzi, Gecko, and Balboa overheat pages as different products with different limits.

For a broader homeowner overview of water that feels hotter than the setting and high-limit stop conditions, see Why Is My Hot Tub Getting Too Hot?. Other Sundance panel messages TubWise has published are listed on Sundance error codes.