Sime Super 90 - can't add water to Central heating. Non Ret

[snowmunki]

Hi,

The pressure on my Sime Super 90 MKII was very low so turned the two blue knobs to add water to the system but nothing happened

Pretty much spent all day and finally removed the non return valve and I believe it may be broken, as water is not flowing through easily.

Looking around the size seems to not be standard, either between 10 - 12mm whereas at B&Q all they had was 15mm ones.

Just wondering if anyone knows where I can get one from ?

Thanks,

 

[bobw1956]

Should be 15mm,if your pipework is 15mm, remove the "blue knobs"and use a spanner to open both valves,

 

[snowmunki]

thanks, but when i went to B&Q and checked the other 15mm ones, it is definately less than 15mm.

Makes it a pain to buy a replacement, looking around an official SIME one is about £50