Ravenheat CSI 85 ignition problem

[efficient]

Hi i mostly install but thought id give fault finding ago.... Got the above boiler no spark, pumps working, no fan. No power to fan. Instruction say check 240v at pin IO at the ignition board. Took the ignition board off the gas valve for a better look and cant find a pin labelled IO. Can anyone shed some light on this please.

 

[jtsplumbing]

No power to fan ! faulty PCB

 

[efficient]

Yeah but i need to prove before i tell the customer the bad news, it could be the overheat stat or ignition board. Anyway figured out its pin 10 not IO miss print one thinks.