SESH
MAAX Spas
Sensor Short Circuit / High Temperature Reading
Display shows SESH or SH; spa may shut down for safety.
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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
Shorted sensor leads, Water intrusion into sensor, Sensor cable pinched, Control board sensor input failure
How to Fix / Troubleshooting
Warning: A shorted sensor can falsely indicate extreme temperatures. Verify actual water temperature before proceeding.
- Measure water temp: Use a separate thermometer to confirm the spa is not actually overheating.
- Power off: Turn off the breaker.
- Inspect sensor cable: Look for crushed or pinched sections where the insulation may be damaged.
- Check connector: Remove the sensor plug from the control board and inspect for moisture or corrosion. Dry and clean if needed.
- Test resistance: Measure the sensor resistance and compare to MAAX specifications for the current water temperature. A near-zero reading indicates a shorted sensor.
- Replace sensor or board: If the sensor is shorted, replace it. If a new sensor still reads shorted, the control board input may be defective.
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Repair Difficulty
Hard
4/5
Required Part
Temperature Sensor (Thermistor)
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