Water level in toilet cistern rising despite being set

northernmonkeyz · Mar 20, 2021

Hi.
We have a B&Q toilet system (see attached picture) and have an issue where tge water level rises despite adjusting the screw rod.

Example.....
I set it at bedtime last night and the level filled to the line, then this morning it was flushed and when filling again it goes too high and stops at the over flow, causing a trickle of overflow.

I replaced the valve washer as it had perished snd there is no leaking.

Any idea what could be causing this?
I am going away tomorrow and worried that it may start trickling while away.

Thanks.

exedon2 · Mar 20, 2021

Simple answer stop messing about trying to repair something that's done years of hard work.
Replace it with something decent fluidmaster would be my choice less than £15 even for brass shanked version fit and forget.

Knappers · Mar 20, 2021

That's a siamp fill valve, has a vent in top that can cause that problem but replacing valve is prob the best option

Ric2013 · Mar 20, 2021

northernmonkeyz said:
Hi.
We have a B&Q toilet system (see attached picture) and have an issue where tge water level rises despite adjusting the screw rod.

Example.***.
I set it at bedtime last night and the level filled to the line, then this morning it was flushed and when filling again it goes too high and stops at the over flow, causing a trickle of overflow.

I replaced the valve washer as it had perished snd there is no leaking.

Any idea what could be causing this?
I am going away tomorrow and worried that it may start trickling while away.

Thanks.

Are you setting the level after a flush? As sometimes setting levels on an equilibrium valve with the cistern already partially filled will not give an accurate setting.

I always turn off my stopcock when I go away.

steadyon · Mar 20, 2021

1. Which washer did you replace, the inlet valve one or the flush valve one.
2. If the flush valve one, replace the inlet valve washer.
3. Might be a better long term plan to replace as above.
4. If you have an isolation valve on the inlet pipe side, shut it off while you are away.

northernmonkeyz · Mar 20, 2021

exedon2 said:
Simple answer stop messing about trying to repair something that's done years of hard work.
Replace it with something decent fluidmaster would be my choice less than £15 even for brass shanked version fit and forget.

Ha. That's fine happy to change.
Problem is would it be an easy job for someone who does not do any plumbing?

Chuck · Mar 20, 2021

northernmonkeyz said:
Ha. That's fine happy to change.
Problem is would it be an easy job for someone who does not do any plumbing?

As long as you get the version with the brass shank (i.e the thread that it connects to) and read the instruction leaflet it's at the easy end of the DIY spectrum. If the incoming 'tap connector' has a fibre washer, take care not to damage it and/or have a spare one to hand just in case.

There are a gazillion how-to videos on youtube, this one is from the manufacturer:

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Water level in toilet cistern rising despite being set

northernmonkeyz

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exedon2

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