Display shows SN1, spa may not heat, may run pumps but heater icon stays off.

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

Failed primary temp sensor on heater tube, Loose sensor connection at control board, Water intrusion into sensor body

Safety: Shut off power at the breaker.

Check sensor seating: Locate the primary sensor on the heater tube. Ensure it is fully inserted and clamped or threaded properly, with no visible cracks.
Dry and inspect: If there is condensation or water around the sensor, dry the area thoroughly and inspect the O-ring or gasket. Replace the sensor if water has penetrated the body.
Replace sensor if error persists: Install a new SN1-compatible temperature sensor for your QCA Spas control pack, ensuring correct orientation and tight but not over-tightened fit.

Medium 3/5

Primary Temperature Sensor

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