Problem

garethdavies · 24 Dec 2014

I have a boiler.

Gasguru · 24 Dec 2014

If cleaning the small pipes and replacing the pump improved the lockouts then that would indicate to me that the gas valve safety interlock may be the issue.

As an extra safeguard the gas valve will only allow gas through to the burner if there is sufficient differential pressure developed across the pump to operate the gas valve "flowswitch". Unfortunately there are several possible faults...poor water flowrate around the boiler, the "flowswitch" itself is faulty, the pin/stuffing box is sticking or there's a problem with the gas valve.

It's not a problem I've ever come across but the next stage would be to have these parts checked/replaced. None are diy jobs.

garethdavies · 26 Dec 2014

thanks

garethdavies · 3 Jan 2015

garethdavies · 5 Jan 2015

thanks

Gasguru · 5 Jan 2015

Gasguru said:
If cleaning the small pipes and replacing the pump improved the lockouts then that would indicate to me that the gas valve safety interlock may be the issue.

As an extra safeguard the gas valve will only allow gas through to the burner if there is sufficient differential pressure developed across the pump to operate the gas valve "flowswitch". Unfortunately there are several possible faults...poor water flowrate around the boiler, the "flowswitch" itself is faulty, the pin/stuffing box is sticking or there's a problem with the gas valve.

It's not a problem I've ever come across but the next stage would be to have these parts checked/replaced. None are diy jobs.

As I said before...and increasing the pressure to 1.5 bar is almost certainly futile.

garethdavies · 6 Jan 2015

Thanks again

garethdavies · 6 Jan 2015

garethdavies · 6 Jan 2015

Thanks

Bunnyman · 6 Jan 2015

That's all gas an safety stuff u should not mess with unless registered.
With the old model an area ur in u should try mark
http://vaillantservice.co.uk/VAILLANT/Vailliant_Home_Boiler_Repairs_Servicing_Faults.html

garethdavies · 7 Jan 2015

thanks

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Problem

Similar threads