Display shows HL and spa shuts down heater; may be accompanied by DR or LF codes.

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

Low water flow through heater, Scale buildup on heater element, Failing circulation pump, Partially blocked suction or return

Safety: Turn off power and allow spa to cool.

Clean filter: Remove and clean the filter cartridge thoroughly.
Check circulation: Verify strong flow from the circulation return jet. Weak or no flow indicates a pump or blockage issue.
Inspect heater tube: Look for signs of scale or discoloration on the heater tube, which can cause localized overheating.
Reset: After restoring flow, power cycle the spa and monitor operation.

Persistent HL errors suggest a failing circulation pump or heavily scaled heater that should be serviced or replaced.

Medium 3/5

Heater Assembly

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