Flow Sensor replacement or cleaning

[chiefzod]

I've got a couple of 5000l flow sensors that have started to read off now and even with no flow never show as 0. Is there a way to clean the sensor or just replace that sensor part? I've tried a quick clean of the sensor itself removed the flow unit housing but still no luck. Would be annoying to have to replace the lot.

[Vinny]

There are no moving parts inside the flow sensor itself. I would check for any obstructions inside the FS and swap the cables between them to see if the problem transfers over or not.

[chiefzod]

I have 2 and have swapped cables and they both read wrong. One more than the other. But example for both with pump off its still reading over a 1000l/h of flow. I'll try looking inside the sensor pipe but I cleaned the actual sensor part by removing it.