E09
SPRSUN
Phase / Voltage Protection (for 3‑phase models) or Power Supply Error
Unit displays E09 and will not start heating; may occur after power fluctuations.
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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
Incorrect phase sequence on 3‑phase power, Missing phase or low line voltage, Loose power terminal connections, Faulty phase protection module on control board
How to Fix / Troubleshooting
Safety first: Only qualified personnel should work on 3‑phase electrical connections. Turn off and lock out power before opening the electrical compartment.
- Verify supply: Use a multimeter to confirm correct voltage on all phases at the unit's terminal block. Compare to the SPRSUN nameplate rating.
- Check phase rotation: On 3‑phase models, ensure the phase sequence is correct (L1-L2-L3). If the unit indicates phase error, a technician can swap two phases to correct rotation.
- Tighten terminals: Inspect and tighten all line and ground connections. Loose lugs can cause voltage drops and nuisance trips.
- Monitor stability: If your supply voltage is unstable, consider having an electrician or utility check the service.
- Component check: If E09 persists with correct and stable power, the phase/voltage protection circuit on the main PCB may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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