HL
QCA Spas
High-Limit Trip Without True Overheat
Display shows HL or HLo, spa may shut down heater and sometimes pumps, water may not feel excessively hot.
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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.
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Possible Causes
Air pocket in heater tube, Loose high-limit sensor, Poor water circulation, Failing high-limit sensor
How to Fix / Troubleshooting
Safety: Turn off power at the breaker.
- Bleed air from heater and pump: Loosen the pump union and heater union slightly until air escapes and water seeps out, then retighten. This ensures the heater tube is fully flooded.
- Check sensor mounting: Confirm the high-limit sensor is firmly attached to the heater tube and making good thermal contact. Tighten clamp or fitting as needed.
- Restore flow: Clean or replace the filter and verify that the circulation or low-speed pump runs continuously during heating.
- Replace sensor if nuisance trips continue: If HL appears repeatedly with normal water temperature and good flow, replace the high-limit sensor.
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Repair Difficulty
Medium
3/5
Required Part
High-Limit Sensor
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