SE
Michael Phelps Spas
Sensor Error or Sensor Out of Sync
Display shows SE or SEn and spa may not heat correctly
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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
Temperature and high-limit sensors reading too far apart, Loose sensor connections, One sensor failing or out of calibration, Water not circulating evenly around sensors
How to Fix / Troubleshooting
Safety: Turn OFF power at the GFCI breaker.
- Inspect both sensors: Locate the primary temperature sensor and high-limit sensor on the heater manifold. Ensure both are fully seated and tight.
- Check connectors: Unplug and replug both sensor connectors at the control pack, inspecting for corrosion or moisture.
- Verify flow: Make sure there is good water flow through the heater so both sensors see similar temperatures. Clean filters and bleed air if needed.
- Replace suspect sensor: If one sensor shows obvious damage or tests out of spec, replace it with an OEM Michael Phelps/ Master Spas-compatible sensor.
If SE remains after sensor replacement and flow verification, the control board’s sensor circuitry may be faulty.
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Repair Difficulty
Medium
3/5
Required Part
Temperature Sensor Set (Primary and High-Limit)
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