O rings

[Gham]

Hi,

I'm in the process of replacing the secondary heat exchanger on my Ariston Combi. When I took it off, there is only one 0 ring - is this right, or should there be four (one on each flow and return for heating and water?)

I've never had any leak problems so I assume this may be correct? (I also ordered the part no. from the manual for o rings and only got one...)

Thanks
Graham

 

[Gasguru]

The other 3 are stuck to the manifolds...use a pin to prise them out and a dab of silcone GREASE to hold the new ones in place.