combi fed H.W. tap drain down problem

[dean.diy]

Hello, my first post.Changing a kitchen hot tap washer, couldn't stop the flow after closing combi mains valve.Could there be a large loop going around the loft I hadn't accounted for? Water continued flowing for several minutes without ceasing from all downstairs H.W. taps.
Advice appreciated. Thanks, Dean

 

[JAP&H]

Hi Dean welcome.

Is the combi a Vokera? Found quite a few of these have had broken cold water inlet valves.

Have you tried turning off the cold water to the property? Bit OTT but may be necessary.

 

[mountainman]

Are you sure you closed the correct valve?
Try turning the mains to the premises off.

 

[dean.diy]

thanks JAP&H and mountainman. Boiler's not that old so made mistake of assuming
all's ok. Lady of the house suggested on my return that I turn MAIN stopcock off.
Got to follow customer's orders ( sometimes!).Great forum, thanks again.