Hot water not firing on Worcester Bosch combi boiler

[GSUTTY8]

I have noticed the pressure is dropping gradually from 1000+ to just over 500 then I have to top it up. There are no leaks I can see but somebody has just told me it may be an outside leak?

The problem I have noticed is first thing in the morning the boiler isnt firing when I run hot water so its running cold. You can hear the boiler spark but then there is no "woof" and the boiler doesnt come on. I have to keep turning tap on and off until it fires up. I assume it is pressure related as works fine normally??

Cold showers are not good at 6am on a winter morning!

 

[gas4you]

Which worcester combi is it?

 

[GSUTTY8]

Its the 240

 

[bengasman]

pressure dropping = leak, no 2 ways about it.
dhw problem most likely diverter

 

[GSUTTY8]

I had the diverter valve replaced about 3 months ago

The reason I didnt think it was that this time is because it only seems to happen first thing in the morning? It is fine the rest of the time???

 

[GSUTTY8]

I now dont have hot water at any time when the heating is not on!!!

I have had the diverter valve replaced recently. Could the same thing of happened again and if so did the plumber do anything wrong? How long should they last for?

 

[AlanE]

How long should they last for?

No time at all if the system water is dirty!

 

[namsag]

If it was the divertor valve you would not be hearing it sparking and trying to light

 

[GSUTTY8]

So if i drain the system would that help at all?

Or do I now need a new diverter valve? And should the plumber who replaced it previously not have done this?

 

[GSUTTY8]

namsag - that was happening at first - now though it doesnt spark at all - its just not doing anything and wont heat water unless heating is on