Boiler sometimes does not produce hot water

[hughwatkins]

We have a Alpha Combi HE CB33 boiler which has recently started to fail to heat the hot water. Sometimes you turn on the hot tap full and no hot water comes out even after running for 30 seconds. Sometimes it is hot as normal as soon as the boiler kicks in. On one occasion the hot water cut out mid-shower.

Any ideas what could be wrong?

Many thanks
Hugh

 

[Mike Jackson]

Not over familiar with the He alphas but sounds as though it could be a split diaphragm in the diverter.

Mike

 

[GPS164]

Does the hot water work when the heating is on?

 

[pnhsolutions]

diverter valve issue!

 

[hughwatkins]

It seems to be worse when the heating is on. In the morning the heating is on and we really notice the problem (hot water not kicking in).

If it is diverter value issue or diaphram can they be repaired or just replaced.

Any idea of costs of parts for either or fitting times?

Many thanks,

Hugh