Which diaphragm for Vokera 24e maxin

[DavidK_N_East]

Hi all,
The hot water stopped working on my boiler and it was suggested checking the diaphragm. I am going to try this but after checking the manual there are two diaphragms, flow and domestic, can anybody let me know which one i need?

Thanks

Dave

 

[cross thread]

if the heating is ok. replace the domestic

 

[DavidK_N_East]

Cheers for that, much appreciated.