The display shows OHt or OHT, and the spa shuts down the heater and possibly the pumps.

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

Scale buildup inside the heater, Restricted flow through the heater, Failing circulation pump, Sensor not fully seated on the heater tube

Safety first: Turn off power and allow the spa to cool before working on the heater.

Clean filter and check valves: Ensure maximum flow by cleaning the Everlast filter and verifying all valves are open.
Inspect heater tube: Remove the heater assembly if necessary and inspect for heavy scale or mineral buildup. Descale or replace the heater.
Check sensor mounting: Confirm that the heater sensor is firmly clamped to the heater tube or fully inserted into its well with thermal compound, if specified.
Test circulation pump: Replace the Everlast circulation pump if it is noisy, hot, or not moving water adequately.

Hard 4/5

Heater Assembly

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