Gerberit flush valve cant get off

[plumbingnovice1812]

Hi So I have the apparently typical constant running cistern problem.
My issue is I cannot for the life of me get the damn thing off to check the seal underneath.
I've tried twist anti clockwise and lift, looked for clips on either side and it's just not coming free. I really don't want to break it by just blindly going at it.
Any help would be greatly appreciated

 

[Wayners]

Take cistern off. Two screws at the bottom inside cistern.
Be a nut under and removed the syphon to inspect.
You may need new doughnut under when you fit back on. Wickes sell plus new coupling rubbers ect. Also other DIY stores stock

 

[Madrab]

That's a twist to unlock and pull up type -

note @ 50secs and it shows you twist the body anticlockwise an that peg in your 2nd pic clicks into the channel and then the valve pulls up.

 

[plumbingnovice1812]

Thanks
Turns out the damn thing was limescale shut. Had to put a lot of force into getting it to turn.
Need to buy a new washer for it but that's saved my partner calling a plumber out.

 

[Elkato531]

Gerberit flush seals often fail because they get little water filled blisters on them. Best to replace but if you pop the blisters with a pin, the valve should be fine until you can hold of another seal.