Grey waste tank

[grp]

Made mistake of leaving Hymer T654gold with grey waste full in the warm weather. I’ve emptied now but warning light still on. Manual says always empty tank when leaving and clean out tank and sensors
But manual doesn’t say how to access the tank? Anyone know, can be accessed?

 

[Stealaway]

Made mistake of leaving Hymer T654gold with grey waste full in the warm weather. I’ve emptied now but warning light still on. Manual says always empty tank when leaving and clean out tank and sensors
But manual doesn’t say how to access the tank? Anyone know, can be accessed?

There is often a round inspection bung in the bottom of the tank.
BUT
The level sensors are almost a waste of space - seldom work and even less accurate.
I like to keep as clean as possible by crushing up some dishwasher tablets and pouring Toilet Duck down the sinks. A gallon of water and run around with that for at least day.

It might work

 

[DBK]

I would just ignore the signal. If you really want to try and fix it you could run the water until the tank is full, which you will know because either you will see water dripping underneath if there is an overflow or it won't drain from the sinks. While the water is running add plenty of detergent or better still a couple or more of dissolved washing up machine capsules. You could go for a drive to agitate it a bit but if it is full just leave it overnight then drain. This might cure it but from time to time the light will come back.

If you can access the tank (you may have to crawl under the vehicle) the sensor will look like a screw or bolt near the top of the tank with a wire attached. You can unscrew and clean it but the light will come on again sooner or later.

Squirting a bit of bio laundry liquid down a plughole every few days helps.

 

[grp]

Ah right! I was thinking an access on top of tank from inside, I need to crawl under then but might be simpler from what you both say to put liquid in it and drive around for a while
Thank you!