Vokera Flowmatic

[kingkarl]

Hi there,

I have recently fitted a new diaphragm to the above boiler, since then the hot water has become hotter even though the thermostat is turned down and the water pressure is at max.

Whenever i now run a bath the boiler and pilot light shut down and need to be re-lit after 5 mins or so, seems fine with the CH

Any idea's

Cheers
Karl

 

[kingkarl]

Iv now been told to replace the DH stat, does this sound about right

 

[barryauid]

Have you made sure you have run the central heating to move air out of the heat exchanger

 

[scatmanjohn]

Do you see that big white barrel shaped thing in the back right hand corner?

Have you bled it?

 

[kingkarl]

I have run the CH system, but i never bled the white barrel thing... is that an expansion vessle

How do you bleed them

 

[timmy74]

usually a brass nut on the top slightly crack it open till it starts dripping and tighten

 

[kingkarl]

Nice one ill try it tommorow, is it the expansion vessle ?

 

[timmy74]

no its the secondary heat exchanger or calorifier as vokera call it

 

[kingkarl]

Thanks, ill let you know if it does the trick... at the mo DH is at 80deg and seems very hot, i dont know if this is about right

 

[scatmanjohn]

80 deg? are you sure...the gauge on the front does not show the temp of the water comming out of the tap.

80 deg would take your skin off

 

[kingkarl]

No sorry i mean 80deg on the gauge

 

[DP]

Have you made sure you have run the central heating to move air out of the heat exchanger

What does this have to do with HW demand?

80 degrees on the temperature scale would indeed suggest water is too hot especially with HW stat at minimum.

Can you see the flame modulating between high and low when HW stat is rotated back and forth slowly? Does this happen when boiler operating in CH mode?

 

[kingkarl]

No it only cuts out if im running a bath, I cant really see the flame fluctuating as i move the control to be honest

 

[DP]

Replace the HW stat. I suspect you have two faults or safety stat has been bypassed

 

[barryauid]

DP instead of trying to make it look like you are the only one who knows what he is doing, people are only making suggestions if we were in front of the appliance we would have a better chance of diagnosing it. We dont all work with vokera all the time.Keep your fly comments to your self or share them in macclefield.