• Ensure there is enough water in reservoir, right up to the overflow
• Ensure channel from impeller to the up tube is clear
• Ensure the up tube is clear
• Ensure tap at the top is clear
• Flush the feed lines with a syringe or bulb instrument
• look at the position of the impeller on the shaft. It can move up or down. Repositioning it can improve the flow of water to the top story.
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