Water tank gauge.

My fresh water tank level indicator is stuck on low. Despite driving with a part full tank it will not move so I am stuck with a red screen and no idea of water level. Has anyone removed the sensor unit and attempted to free it using vinegar or similar. If so how did you do it and are there any snags to look for please.      Many thanks.

I recently cleaned mine with citric acid crystals. Make up a solution with about 500 grams and put it in the tank then fill up with water and leave overnight. Check the levels before draining and if necessary leave longer. I wouldn’t use vinegar the smell and taste are not easy to get rid of.

We have and still have problems with both water and waste tank. We had the sensors removed and replaced but problems have returned, sorry cannot offer any help

Thanks Willy I will certainlygive it a try. Where do I get the citric acid crystals from please ?

Citric acid crytals also worked superbly for me.  I got them from Aldi but they are cheaper on Amazon.  I di have one small issue. I dissolved the crystals in hot water from our taps (40C) and we have the Whale inlet so I had to pump it in. On the third and final 10 litres of hot water the external pump started making a different noise. I IMMEDIATELY stopped and pulled it out and cooled it down in cold water and then put in some cold water before resuming to complete pumping in the warm citrica acid. Noise reurned to normal.
I suspect that there was some differential expansion of the impeller and its shaft!  Be warned!

Mine came from Amazon too. £3.50 for 500mg, Ballihoo brewery.