E3
Poolex
Defrost Protection / Defrost Sensor Error
Poolex pool heater shows E3 and stops; may occur during defrost cycles.
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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
Defective evaporator/defrost sensor, Sensor not properly attached to coil, Control board defrost algorithm fault, Excessive ice buildup on evaporator
How to Fix / Troubleshooting
Safety: Turn off power before touching internal components. Beware of sharp coil fins.
Steps:
- Inspect evaporator coil: Check for heavy ice buildup. If present, allow the unit to thaw naturally by turning it off for several hours.
- Check sensor placement: Ensure the defrost sensor is firmly attached to the coil where originally installed.
- Clean coil: Remove debris that may be blocking airflow and causing excessive icing.
Sensor replacement:
- Replace the Poolex defrost/evaporator NTC sensor if it is damaged or reading incorrectly.
If E3 persists, a technician should verify defrost control parameters and main PCB operation.
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Repair Difficulty
Medium
3/5
Required Part
Defrost Temperature Sensor
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