HL
Wellis
High-Limit Trip (Local Overheat at Heater)
Display shows HL or HLo, pumps may run but heater is disabled
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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
Restricted flow through heater, Scale buildup on heater element, Failing high-limit sensor, Circulation pump not running continuously
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before accessing the heater or sensors.
- 1. Let spa cool:
- Allow water and heater to cool for 15–30 minutes.
- 2. Clean filters and verify flow:
- Rinse filters thoroughly or try running briefly without them.
- Ensure all valves are open and that you feel strong flow from heater return.
- 3. Inspect heater and sensor:
- Locate the high-limit sensor on the heater tube.
- Check that it is firmly attached and not loose.
- 4. Reset and monitor:
- Restore power and monitor temperature rise.
- If HL recurs quickly, have a technician test the high-limit sensor and inspect for internal heater scaling.
- 5. Replace components as needed:
- Replace the high-limit sensor or heater assembly if found defective.
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Repair Difficulty
Medium
3/5
Required Part
High-Limit Sensor
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