gas boiler not lighting

El Kabong!

Hi,

Would appreciate some advice on this. Here is the history.

A few years ago I replaced all the rads in the house.
At the same time I replaced the pump for the gas boiler.

The new pump needed valves either sides, which I installed. At the time I didn't realise they were isolation valves. I already had two good valves further down the pipework on either side.

It all worked 100%.

Last March the heat stopped. The boiler had no pressure.
I noticed that the isolation valve nut on the right of the pump was leaking.
It was a quarter turn valve so I tweaked a bit and it stopped.

I added water to the system and it all worked 100% again.
The valve might not have been 100% open as I tweaked it.

Because I already had good valves either side I was going to seal these ones up, instead of having to remove/refit.

It kept working 100% and the pressure never budged.


Last week I check the system and it worked 100%.

Last night was cold so I thought I would put it on for an hour, but it wouldn't work.

Water pressure was fine. Valve not leaking.

I fiddled with the valve thinking it was not open 100% but I could not get the boiler to catch. The isolation valve is just a nut with no handle so I ended up forgetting which quarter turn was on/off and tried it in varying positions for ages, with no luck.

At one point the pressure went crazy and it cut off.


At the moment I think I have all the valves in the right position.
The boiler pressure is fine.
No rads need bleeding.

But it won't catch.... it clicks for a while and sometimes does, but it will only last 10 seconds or so.




So!

My question is..... with all the fiddling, and possibly having run the boiler with the isolation valves closed for a while, could I have introduced an airlock or something to the boiler? and if so is it DIY to fix this?


If not I will just ring the boiler service crew....

Thanks!

Dtp1979

El Kabong! wrote: »

Hi,

Would appreciate some advice on this. Here is the history.

A few years ago I replaced all the rads in the house.
At the same time I replaced the pump for the gas boiler.

The new pump needed valves either sides, which I installed. At the time I didn't realise they were isolation valves. I already had two good valves further down the pipework on either side.

It all worked 100%.

Last March the heat stopped. The boiler had no pressure.
I noticed that the isolation valve nut on the right of the pump was leaking.
It was a quarter turn valve so I tweaked a bit and it stopped.

I added water to the system and it all worked 100% again.
The valve might not have been 100% open as I tweaked it.

Because I already had good valves either side I was going to seal these ones up, instead of having to remove/refit.

It kept working 100% and the pressure never budged.


Last week I check the system and it worked 100%.

Last night was cold so I thought I would put it on for an hour, but it wouldn't work.

Water pressure was fine. Valve not leaking.

I fiddled with the valve thinking it was not open 100% but I could not get the boiler to catch. The isolation valve is just a nut with no handle so I ended up forgetting which quarter turn was on/off and tried it in varying positions for ages, with no luck.

At one point the pressure went crazy and it cut off.


At the moment I think I have all the valves in the right position.
The boiler pressure is fine.
No rads need bleeding.

But it won't catch.... it clicks for a while and sometimes does, but it will only last 10 seconds or so.




So!

My question is..... with all the fiddling, and possibly having run the boiler with the isolation valves closed for a while, could I have introduced an airlock or something to the boiler? and if so is it DIY to fix this?


If not I will just ring the boiler service crew....

Thanks!

Ring the boiler service crew.