Thorne Homewarmer E Back Boiler problems!

[Sammer1]

Hi all, First time on here.
I have a big problem. I have recently rebooted my central heating system after about 10months of inactivity, due to changing of rads and have the following problems -:
I cannot get the back boiler pilot light to stay on. I have held the button as long as recommened and ignited the light, however when I release the button it just go's out. When I have had success in keeping the light on I cannot get the back boiler to light up. When I swuitched the C/H on via the terminal before I could here a whoosh and then the back boiler kicked into life, however now all it do's is click.
Can any one help me.

Thanks,

Sammer

 

[Plumber Will]

The button on the gas valve (grey one) are you sure it is turned to flame when the pilot light has been ignited. There are two marks on the button one like a spark the other the flame.

The sequence is...Turn grey to spark press ignite with red button, turn grey to flame.