Vaillant Boiler - 'Dust in Gas System'

footyguy

atlantis187 wrote: »

Thanks for your help guys I managed to convince vaillant to send out an engineer out free of charge
He has just been and changed the gas valve again for a new one. He said there is a lot of 'sulphure' dirty muck getting into the valve and I should get an inline filter fitted.

Because there is muck getting into the boiler coming from the supply is this my responsibility or should national grid or my supplier British gas sort this.

Thanks

Total sulphur content (incl H2S) should not be greater than 50 mg/m3
H2S should not be greater than 5 mg/m3

http://www2.nationalgrid.com/uk/industry-information/gas-transmission-system-operations/gas-quality/

I would expect any boiler manufacturer to make a boiler that can cater for up to this limit.

If the guy can prove it's greater than this, then he/you should be onto National Grid about it.

AndyPK

I think F28 means either no gas or no ignition.

If the problem was intermittent, and the gas valve was replaced it could be an ignition problem.

I would ignore the "filter" rubbish and either get a local plumber or one off repair.

atlantis187

Vaillant have been out twice now in the space of 6 weeks and both times have replaced the gas valve for a new one.


obviously i'm no engineer but even I would say a brand new gas valve should last more than 6 weeks.


When he came today he showed it to me and it was all black covered with some sort of muck. I do reckon it is a problem with the supply.
What I need to know is will this be my responsibility or national grid?

unclebulgaria

AndyPK wrote: »

I think F28 means either no gas or no ignition.

If the problem was intermittent, and the gas valve was replaced it could be an ignition problem.

I would ignore the "filter" rubbish and either get a local plumber or one off repair.

This "filter rubbish" isn't actually rubbish! Our natural gas reacts with the copper supply piping to create a coating that looks similar in colour to charcoal. It forms very very fine scale that will turn to dust if rubbed or knocked. This dust makes its way into your gas valve and stops it working. The filter the guy is talking about has nothing to do with water supply or the water in your central heating system. It captures the dust before it gets into your gas valve and causes damage by blocking it.
Read footguy's post he has it spot on though nobody makes a boiler that can cope with this as its the manufacturer of the gas valve that's possibly at fault. Call national grid and explain that your gas supply may be causing issues and you require the gas supply composition to be checked.
The filter will be installed just before the appliance.