My cistern is only emptying of water on flush about half way, resulting in a
very short flush. It is filling up to it's normal level and not leaking.
Googling comes up with the suction washer as a probable culprit. Is this an
easy/inexpensive job. The reason I ask is that this is a Housing
Association property, but I live alone and am out at work all day, and it is
a pain waiting for contractors to call, not counting the lost wages. If it
is a DIY I will do it myself.
Are you sure that it isn't a "water saving mechanism"?
If you hold the lever down or keep pulling the chain, do you get a full
With some, it is a user-setting to enable or disable water saving.
Typically, they let air in after the water has fallen half way, rather
than when the tank is almost empty.
I don't think it is the suction washer - that would stop it flushing at
all. Once it starts flushing, the syphon effect takes over and the
suction washer plays no further part.
So look for some way that air gets in when the level falls half way.
IANA plumber...this is just how I remember them working - I don't have
toilets with this feature in my present house, they are too old..
The max flush allowed nowadays is 6 litres. Many cistern designs
are still for more than that, and the syphon has an inlet to stop
the flush before the cistern empties, to limit flush to 6 litres.
Try refilling the cistern using a measuring jug up to the normal
level, and see how much water it takes. If it's 6 litres, then
there's nothing wrong with it.
Palindr?me was spot on. I found a small plastic plug in the bottom of the
cistern and eventually found a matching hole in the works. Refitted the
plug and hooray, I am back to a normal flush.
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