QCA Spas Sensor Error or Sensor Out of Range

Display shows SE or SEn, spa may operate but some functions are disabled.

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

Incorrect sensor type installed, Sensor wiring reversed, Sensor resistance out of spec, Control board firmware mismatch

Safety: Turn off power before working on sensors or the control pack.

Confirm correct sensor: Verify that the replacement sensor (if recently changed) is the correct part number for your QCA Spas control pack.
Check connections: Ensure sensor plugs are in the correct sockets on the control board (temp vs. high-limit) and fully seated.
Replace with matched pair: If SE persists, replace both temperature and high-limit sensors as a matched set to ensure compatibility.

Hard 4/5

Sensor Kit (Temperature and High-Limit)

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