Toilet Cistern has a mind of its own

50Twuncle

We keep on being woken up in the wee small houtrs by our toilet cistern - not only filling itself up - but also emptying itself !
I can understand the filling bit - due to the increased pressure at 3 am - but "EMPTYING ITSELF !!
The problem started about a month ago and it is now starting to concern me - (expense if I don't wake up)
Will a replacement (dual flush) valve help or do we need a pressure reducing device in the feed ?

Grenage

The flap is probably not getting a proper seal at the base of the cistern.

50Twuncle

Grenage wrote: »

The flap is probably not getting a proper seal at the base of the cistern.

Thanks - does the flap come as part of the flush valve set up ?

getmore4less

Take the lid off and have look what's in there.

There a few different options for in and out.

surveyqueenuk

When you have the lid off, make a note of any codes etched on the underside (if there are any) as this will indicate what model of bog you have.

Heedtheadvice

Sounds like a case of sleep walking to me!

Some cisterns have overflow that vent into the pan. Check that the fill valve is sealing properly and that the water level is not too high.

flashg67

Turn off the water supply and see if the level drops - if it does, likely the flush valve is leaking. Or add some food dye to the cistern, and see if it leaks into the pan.