HI
Raypak
High Water Temperature or Outlet Sensor Trip
Display shows HI or HIGH TEMP; Raypak unit shuts down and will not heat until cooled.
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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
Thermostat set too high, Stuck contactor or relay causing overrun, Faulty outlet water temperature sensor, Poor water flow causing localized overheating
How to Fix / Troubleshooting
Safety first: Turn off power and allow the unit to cool before opening panels or touching plumbing.
- Check setpoint: Verify the desired water temperature on the Raypak controller. Reduce it to a reasonable level (e.g., 80–88°F for pools, 100–104°F for spas).
- Confirm water flow: Ensure the circulation pump is running and that valves are open. Clean the filter and check for any obstructions in the heater inlet/outlet.
- Inspect outlet sensor: Locate the outlet water temperature sensor on the Raypak manifold. Check that it is firmly seated and not coated with scale. Clean gently if accessible.
- Reset and monitor: After correcting flow and settings, power cycle the unit and monitor operation. If HI recurs quickly, the outlet sensor or control board may be faulty and should be tested and replaced as needed.
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Repair Difficulty
Medium
3/5
Required Part
Outlet Water Temperature Sensor
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