worchester 24 cdi fault

[lazygenius]

evening all, just looking for a bit of advice on this particular problem.
im a corgi registered engineer with little fault finding experience on combi boilers, so when my mate asked me to have a look at his i was reluctant but since he was a bit a bit skint i agreed.
the boiler is a room sealed 24di and basicly its a flame failure problem, ch light is flashing slowly, which on the flow diagram indicates flame failure, and the hw light is flashing quickly, which either indicates fan fault ( which is fine) or PCB fault. Might seem a little obv but just thought id ask for some advice before i go and splash out on a new board only to find out it was something else!
cheers

 

[scatmanjohn]

Whats it doing before the lights start flashing?

owt or nowt?

 

[lazygenius]

fan starts, pump starts, no flame

 

[scatmanjohn]

fan starts, pump starts, no flame

Any sparking?

 

[lazygenius]

nah no spark and the electrodes look in pretty good nick

 

[scatmanjohn]

APS making?

 

[lazygenius]

yeah i think so, not had it out to test it but wouldnt the fan fail if it wasnt making?

 

[Gasguru]

Have found in the past this to be pcb failure (APS,fan check out OK). Given the price of a board its a better option to call out Worcester and get a years warranty on the whole boiler.

 

[lazygenius]

cheers for the help guys. replaced the board and the boiler is running fine. told him to get the scottish gas insurance for it to save shelling out big time again