Display shows HOT; the spa temperature is above the safe operating range, and the heater is disabled.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Stuck heater relay on the control board, incorrect sensor reading high, prolonged high ambient temperature with the cover on, circulation failure causing localized overheating.

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker. Do not enter the spa until the water cools to a safe temperature.

1. Remove cover: Allow the spa to cool naturally with the cover off.
2. Verify temperature: Use a separate thermometer to confirm the actual water temperature.
3. Inspect circulation: Once cooled and power is restored, verify that the circulation pump is running and that there is good flow through the heater.
4. Monitor heater operation: If the heater energizes when the water is already at or above the set temperature, the heater relay or sensor may be faulty.
When to call a technician: Overheating can be dangerous. Have a professional test the heater relay, sensors, and circulation system.

Repair Difficulty

Hard 4/5

Required Part

Control Board (Heater Relay)

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