Vitodens 100 losing pressure

[smigg]

All,

I've got a Vitodens 100 that is about 5 years old and am having a continuing problem with it. For a while now it has been going through periods where it will need the pressure topping up every couple of days. Then it will work for months with no problem. Then it'll start losing pressure again. I had an engineer from one of the big 6 out last week to service it, and since then I've had to top it up every morning and evening if the heating has been running (so if the heating is on in the morning, I'll need to top it up in the evening and vice versa). I've checked this morning (after having to top it up) and have noticed that, while the heating was running, there is water dripping out of the overflow. Presumably this is where the pressure is going, but does anyone know why this happens so often?

Thanks
Smigg

 

[Agile]

The expansion vessel may have failed or needs repressurising. See the FAQ on this site.

The engineer may have used the PRV to let water out. It may now need replacing.

A conscientious engineer would have checked the EXV and would not have used the PRV to let water out or at least would have checked that its sealing afterwards. But then you said you used a big firm !

Most would say call him back!

Tony

 

[smigg]

Hi Tony,

thanks for the reply. I'll see if it continues over the next day or so and then yes I think I'll be getting them out again!!

Thanks
Smigg

 

[stevw451]

I work on these nearly every day in social housing and its usually the ex vessel not the prv the vitodens 100 is a bag of hammers

 

[mysteryman]

That one was replaced by a new model in 2008.

 

[stevw451]

its all well and good bringing out a newer better model but to allow a model with so many faults onto the market in the first place viessmann should hang their head in shame

 

[bengasman]

Complain to the company about what is happening.

 

[stevw451]

they know and it would be like saying to the romans i hope those nails are sharp