Pre pay gas not working Vaillant Boiler

[JimmyAcc]

Hi recently my pre paid gas ran out. I checked and I had 15 credits. I know my mums boiler had the same issue where it shuts off if there are only 15 credits left. She tells me an engineer comes and does something that takes 2 seconds and its working but he never told her why. Its a Vaillant boiler I tried topping up another £10 and put the card in to release gas and gas meter shows "o" which I think means on. No gas appliances in house to check gas supply. It is showing either F28 or F29 when I reset. Anyone any ideas?

 

[Deleted member 120897]

If it’s a smart meter, you may need to wait 60 - 120 seconds before relighting the appliance. This is a safety feature if the gas meter to prevent a buildup of gas in the appliance.

 

[JimmyAcc]

Thanks for the reply. Its not a smart meter its a old pay as you go meter.

 

[JimmyAcc]

Heres pictures of my boiler and meter if that helps.

 

[Deleted member 120897]

If you press button a, does it tell you on screen if the gas is on (It should do)? Have you pressed the reset button on boiler for approx 10 seconds? Does the boiler reset and then fail to F28?

 

[JimmyAcc]

If you press button a, does it tell you on screen if the gas is on (It should do)? Have you pressed the reset button on boiler for approx 10 seconds? Does the boiler reset and then fail to F28?

Button A doesnt do anything for me. Whether I press it, hold it nothing happens. If I press button B it tells me to hold it in to release gas but nothing appears to happen when I release it.

Yes when i use the reset button the yellow light goes on and off about 5 times then the red light and f28 error.

 

[Deleted member 120897]

Button A doesnt do anything for me. Whether I press it, hold it nothing happens. If I press button B it tells me to hold it in to release gas but nothing appears to happen when I release it.

Yes when i use the reset button the yellow light goes on and off about 5 times then the red light and f28 error.

So basically the gas isn’t getting to the boiler. If you’re pressing button B and holding it, but nothing happens, then it could be the meter. Normally it will state in screen opening valve, and then you’ll hear a clunk, which is it opening. F28 will be a lack of gas to the appliance and has failed safe.

 

[JimmyAcc]

Well I have tried a few times, it may have worked the first time. I just checked the manual for my meter and according to the manual the o in the bottom left corner shows that the gas valve is open.

 

[Deleted member 120897]

I‘d say it’s going to be a faulty meter. You’ve not turned the gas isolation valve off underneath the boiler have you? Is the condensate pipe frozen?

 

[Deleted member 120897]

Looks like this is your meter?

https://www.phoenixnaturalgas.com/assets/general/How_To-Use_Your_Libra_110_Gas_Meter.pdf

 

[JimmyAcc]

Yeah that seems to be the one I have.

 

[JimmyAcc]

Fwiw when I tried it again it is showing F29 error now.

 

[Deleted member 120897]

Fwiw when I tried it again it is showing F29 error now.

F29, is usually when the boiler has lit, so there may have been a small amount of gas coming through.

 

[JimmyAcc]

After some googling I seen it suggested that it could be low gas pressure?

I recently ran out of electric after my gas run out and before I could top it up would this affect anything?

 

[Deleted member 120897]

After some googling I seen it suggested that it could be low gas pressure?

I recently ran out of electric after my gas run out and before I could top it up would this affect anything?

It shouldn’t affect anything. Low gas pressure would be the transporter. is the emergency control valve fully up?

 

[JimmyAcc]

It shouldn’t affect anything. Low gas pressure would be the transporter. is the emergency control valve fully up?

Is that the one on the bottom left here? Should it be up?

 

[Deleted member 120897]

Is that the one on the bottom left here? Should it be up?

Where? I can’t see one, but yes, ECV should be up.