SPRSUN
Short Cycling
Heater starts then stops after a short time; frequent on/off cycling without reaching temperature.
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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 relative to pool volume, Incorrect thermostat differential settings, Poor water flow or air in system, Faulty flow switch intermittently opening
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting internal components; control settings can be changed with power on.
- Bleed air: Ensure the pool circulation system is fully primed and free of air pockets. Bleed air from high points if valves are provided.
- Check flow stability: Observe the filter pressure and flow. Clean the filter and baskets to maintain steady flow.
- Review control settings: If accessible, increase the temperature differential or anti-short-cycle timer according to the SPRSUN manual to reduce rapid cycling.
- Inspect flow switch: A sticking or vibrating flow switch can cause intermittent shutdowns. Replace if suspect.
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Repair Difficulty
Medium
3/5
Required Part
Water Flow Switch
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