ideal concorde cx wont fire up?

[tots]

This floor standing pre historic boiler im working on wont fire up,ive disconnected the high limit stat and tried it again as i thought it coulb be that but still no joy!!😕everything else is working,the pilot is lit the timers calling for heat and the pumps running fine im guessing its the gas valve but ive come to this conclusion with boilers in this situation before and its turned out a deeper routed problem the manufacturer has had to sort.

Does anyone know owt about these boilers??

 

[migoplumber]

yep, love the boilers simplicity, whats the boiler number cx ??
i work on a lot of these prehistoric beasts. it will be one of the circuit boards or if your unluck it will be two of them. can send you the diagnostic flowchart.

shaun

 

[tots]

not sure ill ask