Vailant Eco Tech 624

[Crakkers]

HI

Still having problems!

Pressure drops over night and often prevents CH coming on.

I top up via the filler pipe so the pressure needle reads half way.

Heating comes on and the pressure rises into the red. I have tied a bag to the overflow and water collects into it.

Heating switches off at the designated time at night and the pressure drops again.

I have checked all the pipes with tissue paper and been under the floor. Whilst there is green corrosion around one fitting there is no moisture evidence / drips and I have looked at it whilst the CH is on.

I have one pipe inder a concrete floor (poor builder!!!!!) and cant check that for a leak, but there is no evidence of a leak - laminate floor is not springy etc.

Are there any other checks I can do? Advice you can give me to pin point the fault?

Thanks

 

[holty]

Heating comes on and the pressure rises into the red. I have tied a bag to the overflow and water collects into it.

look up expansion vessel in F&Q

 

[muggles]

Advice you can give me to pin point the fault?

You've already done that

Heating comes on and the pressure rises into the red. I have tied a bag to the overflow and water collects into it.