waste water full??

De winterised at home. Taps all working, clean and waste water outlets working. Arrived on site this evening and display showing waste water 100 percent full (cannot be??) and nothing coming from waste water tap when opened under the van.
Any ideas??  Thanks

Hi Jetty
Could  be the tank level sensors are playing up , you can find lots of information on this  by searching  the site .

The search  box is top right  on this screen.

Bernie

That happens to mine . but it comes and goes  sometimes when freshwater tank is full the waste reads full  .on my van waste  water tank reads full or empty  no half measures  .give the tank a wash out  using cheap cola  .it may help.?

Have the same problem on the Worcester - just bought some Elsan fresh tank cleaner at Harrogate today and will clean the fresh tank then pump,it into the waste tank in the hope it will clean both sets of sensors. 

Just one if the suggestions on this forum.

David

Continued

Put the pump on to heat up some water and a loud buzzer sounded saying the waste tank was full.. this morning I poured a bucket of cold water down the sink and hey presto it came right through bringing out some greb. The indicator now reads that the waste tank is empty. I will clean it out properly when I get back home.
Thanks for the help.