How to fix a faint or blank Sunmi printout
Sunmi
Updated Aug 2026
A faint or blank printout on a Sunmi device is a thermal-paper or print-head issue, not RushFlow. Thermal paper only prints on one side, so the most common cause is the roll loaded the wrong way round.
Step by step
- Check the paper directionThermal paper prints on one side only. If it comes out blank, the roll is likely upside down — flip it so the heat-sensitive side faces the head.
- Use genuine thermal paperFaint output can be poor-quality or old thermal paper. Try a fresh, good roll.
- Clean the print headGently clean the thermal head with a soft, dry (or alcohol-dampened) cloth to remove dust that lightens print.
- Check densityIf your device exposes a print-density setting, increase it slightly.
Frequently asked questions
Why is my Sunmi receipt blank?
Thermal paper prints on one side only — a blank receipt usually means the roll is loaded upside down. Flip it so the heat-sensitive side faces the print head.
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