Vaillant problem

[Rebellion]

Hi can anyone help, a year ago we had no hot water from our vaillant Turbomax combi boiler but heating was OK, we were fitted with a new heat exchanger and all was well, since then a new diverter valve and expansion vessel have also been renewed , but now we have the same problem of no hot water but heating is ok , water pressure is ok and all seems to fire up plus the water temp indicates that there is hot water , hope this makes sense .
Thanks

 

[noseall]

Motherboard?

Fan switch?

 

[mattylad]

plumbing forum perhaps?

 

[nickjb]

When ours stopped giving hot water it was the flow sensor. Small, round plastic bit held in by a circlip. Popped the clip off cleaned out some gunk and all was well. Not sure if that quite matches your symptoms but it is easy to check, 5 min job.

 

[gazdaz36]

Is there hot water coming out of the boiler. Check the pipe that is second from the left to see if it gets hot when there is a hot water demand. If it is hot coming out of the boiler but cold when it reaches your tap, you might have a faulty shower valve/ mixer tap

 

[Bunnyman]

Open tap press the I button an post the status code