Can only get hot water with heating switched on.

[Niamh]

Hi, I'm hoping someone will be able to point me in the right direction with this....

I have a Swift Flow combi boiler and it has always been fine until yesterday when I went to shower no hot water would come out. The only way I could get hot water is if I put the heating on. I'm not sure what the pressure gauge was at before but I know now that it is at zero until you put the heating on then it will creep up to 0.4-0.5. The manual says it should be at 0.7 but doesn't tell me how to change this and there's no access to any of the pipes unless I unscrew panels (which I'm reluctant to do because I have no idea).

Is the solution to my problem changing the pressure?

Also, whilst I'm here... the water is always scolding hot, my shower temp goes from 1-10 and when it's on 3 it's even too hot. How do I change this? I didn't really see this as a problem until a new lodger pointed it out, then I realised it was a bit strange!

Thanks!

 

[onecog]

Firstly you need to find the filling loop and top up the boiler pressure to 1.5 bar and then see what happens.
Look for one of these somewhere near the boiler

http://www.screwfix.com/p/r24-filling-loop/83905?kpid=83905?cm_mmc=Google-_-Product Listing Ads-_-Sales Tracking-_-sales tracking url&gclid=CLqgwqHg3bUCFVDMtAodV

 

[Agile]

As far as I can recall that model may not have a hot water temp adjustment.

That means you need to add cold water to use it.

Not very convenient but its a budget boiler.

Might help to get the boiler serviced regularly.

Tony

 

[onecog]

Not very convenient but its a budget boiler.



Tony

It's an old budget boiler that i used to install in the late 90's in council properties and as i remember it we had to put a manual by-pass within 1m of the boiler which meant extra clutter.

 

[picasso]

The dhw flow switch (most likely culprit) is not seeing the hot tap opening therefore not modulating and this is why you have no hot water without heating and why the hot water is too hot, it looks like your boiler could do with a service.

 

[Niamh]

Thanks everyone. Put the pressure up to 1.5 this morning and it seems to have done the trick, however it has dropped to 1 already...!

 

[picasso]

So now you have hot water without the heating on ?

 

[Niamh]

So now you have hot water without the heating on ?

Seems to have worked.