Wocester bosch 24 ri regular boiler problem!

[rapid]

went to have a look at a worcester bosch 24 ri regular boiler today, turned it on, fan runs, pump runs but no igition/spark, so i undo the hose to the pressure switch and suck it, heard it clicked but no sign of igition. it looks like to me the pressure switch has gone but it's located right at the back of the fan i want to make sure before i do anything, do you agree folks???

 

[Blake]

Would need to do more tests before determining if APS was faulty. Need to test for continuity at the APS, check fan speed, power to gas valve etc etc