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Rainwater pump runs briefly after a toilet flush
A short pump run after a toilet flush seems like it could just be the pump restoring pressure after the cistern refills, but I’m not sure when that pattern points to a fault instead. What’s the useful distinction between one brief run that stops and repeated starts after the flush is finished?
If no rainwater-fed fixture is drawing water, how should I interpret a gradual pressure drop on the system gauge? Could that help narrow down whether water is still being drawn somewhere, or whether the check valve or pressure tank needs attention? I’m interested in what observations are worth noting before calling a pump technician, without treating a single short run as proof something’s wrong.
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2 replies
One brief run that stops after the cistern has refilled can simply be the pump restoring pressure. Repeated starts after demand has ended are more concerning: pressure may still be falling because water is escaping or being drawn, or because the pressure-control system needs attention. The pattern is a reason to investigate, not enough by itself to identify a faulty check valve or tank.
A steady gauge drop with no intended demand is useful evidence that pressure isn’t being held, but it can’t tell you where the water is going. Hidden use or a leak and water returning past a check valve are possibilities. I’d be less quick to treat the pressure tank itself as the cause of a gradual drop: a tank problem can contribute to short cycling, but the gauge pattern alone doesn’t identify it. Note how quickly pressure falls and whether the pump starts again.
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