Grohe Adagio — flush valve leakage problem

[Ulsinus]

My WC is a Grohe adagio side entry concealed cistern.

This is operated by a push-button air bellows.

Recently water continued to spill into the pan after a flush.

The water level in the cistern shuts-off at the correct level.

I replaced the Grohe DAL discharge piston.

The problem remained.

I removed the new discharge piston from the valve assembly and placed in in position at the bottom of the cistern.

Partially filled the cistern and the discharge piston seal did not leak ie no flow of water into the pan.

Refitted the discharge piston to the flush valve assembly.

Flushed the toilet a number of times.

Sometimes the valve operated correctly ie no overflow into pan. Other times discharge didn't seal properly ie water over flows into pan.

I'd be interested to know if anyone else has come across this problem and, if so, how did they solve it.

 

[Riley]

Quite likely lifting mechanism is scaled and sticks partially open. You could drop a bottle of descaler in the cistern overnight

 

[Ulsinus]

Thx Riley.
What do you mean when you refer to 'lifting mechanism'?

 

[tigger1]

As Riley says, could be scaled or for some reason sticking. May be best to replace it. How old isit?

 

[Ulsinus]

Just over five years. It's a downstairs toilet and is not used very often.

 

[tigger1]

Just over five years. It's a downstairs toilet and is not used very often.

In that case open it up, try giving it a clean. Worse case scenario replace it.

 

[AliB]

My WC is a Grohe adagio side entry concealed cistern.

This is operated by a push-button air bellows.

Recently water continued to spill into the pan after a flush.

The water level in the cistern shuts-off at the correct level.

I replaced the Grohe DAL discharge piston.

The problem remained.

I removed the new discharge piston from the valve assembly and placed in in position at the bottom of the cistern.

Partially filled the cistern and the discharge piston seal did not leak ie no flow of water into the pan.

Refitted the discharge piston to the flush valve assembly.

Flushed the toilet a number of times.

Sometimes the valve operated correctly ie no overflow into pan. Other times discharge didn't seal properly ie water over flows into pan.

I'd be interested to know if anyone else has come across this problem and, if so, how did they solve it.

We just had this issue. We were advised by a customer service assistant at Grohe to try removing & cleaning the drop valve, which we did - getting the top bracket off was the hardest & most risky part as it is not replaceable if it breaks - and the drop valve just lifts out.

The base of the centre section of the drop valve had become slightly wedged in the washer - I suspect the washer is weak & may need changing at some point, but taking the drop valve out & giving it a good scrub with a toothpaste does seem to have made a difference. The toilet flushes normally now.

 

[Harvest Fields]

Why has this post just resurfaced again? Anyone any ideas? @ShaunCorbs

 

[ShaunCorbs]

Why has this post just resurfaced again? Anyone any ideas? @ShaunCorbs

On in mod que (post)

 

[Harvest Fields]

I would have spotted that if I was still crew.

 

[moonlight]

I posted about one of these a while back. Did all the things suggested. Worked for a while but kept going wrong. In the end Grohe said the cistern may have warped. New cistern and problem vanished, now been working for 2 years.