My pump pressure jumped up, but I still have flow. What’s causing this?

Two primary sources can cause this problem. The first problem is that something has suddenly caused a fairly major blockage in your system – either through contamination or precipitation – but the blockage is not so major that flow cannot get past, and thus the pump just works as hard as it needs to in order to achieve that flow. The other source of the problem is a defective pressure transducer or regulator, suggesting that the reading you are observing is not an actual reading, but an artificial one created by your pressure readout device.