Vokera 29HE Compact cold water leak - can I sort or call engineer?

[ewanl]

Hi, had my Vokera 29HE Compact serviced last month, but it's begun leaking cold water.

Engineer says it may need a nut tightened, which I can do myself, or a new washer which means them coming out to look at.
About a pint of water is escaping over night.

Which nut is it I should try to tighten, and is the washer something I can replace myself?
Might there be any other cause for the leak?

I've added a photo, leak appears to be travelling down last copper pipe to rhs (DHW?).

Thx,
Ewan

 

[Scott_D]

If you don't have to remove the case you can attempt it yourself.
i can't see the leak from the picture but it is the DHW.

 

[ewanl]

Thanks for the reply scott_d.

The nut on the DHW pipe is on the base of the unit (just out of view at top of photo), so it is outside of the case.
To tighten this should I switch off boiler, shut off water supply - is that what black knob in picture is for?

Is the 'washer' that may have failed something that will be inside the boiler and therefore I'd need an engineer to change?

 

[stevetheplumber]

either tighten or change the washer neither job is illegal but you might need a basin spanner to do it

 

[Scott_D]

The black knob is to 'throttle down' the amount of water passing through the boiler if it cant cope/heat it fast enough.
I would turn off the boiler, shut the cold water valve and open a hot tap to let off the pressure just to be safe.
Tighten then slowly open the cold water valve and check for drips.

 

[P J F PLUMBING]

Easy job try and tighten up first the washer is a 15 mm flat washer common that these leak

 

[ewanl]

Hi,

Thank you all for your suggestions

Will give tightening a go.

Ewan