Poolex
Short Cycling / Control Instability
Poolex pool heater frequently cycles on and off in short intervals (short cycling).
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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
Oversized heater for pool volume, Incorrect thermostat differential settings, Faulty temperature sensor, Flow switch chatter due to marginal water flow
How to Fix / Troubleshooting
Safety: Normal electrical precautions apply.
Steps:
- Check flow stability: Ensure the pool pump runs continuously and that filters are clean to avoid flow switch chatter.
- Review settings: Increase the temperature differential (if adjustable) so the heater runs longer between cycles.
- Verify sensor accuracy: Compare Poolex temperature readings with an external thermometer; replace unstable sensors.
If short cycling continues, consult a technician to review system design and control logic.
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Repair Difficulty
Medium
3/5
Required Part
Water Flow Switch
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