Glow worm ultimate neons 1 and 3

[KevC1]

Hello,

Been to look at a Glow worm ultimate 50 ff. Boiler is making a loud buzzing noise, and neons 1 and 3 are lit.

I was thinking it might be the air pressure switch, but i'm not that familiar with these boilers.

Anybody have any ideas.

Thanks.

 

[45yearsagasman]

Need a few more clues and would suggest this is best discussed in the CC.
I'm confident I know the fault, but its not for the open forum.
It's not the APS.

 

[KevC1]

Thanks for reply.

I've put it in the CC.

Not sure I can give you many more clues. I'm fairly new to fault finding, so I usually need all the help I can get.

Thanks.