Potterton Profile 50e not sparking

[Harvest Fields]

I have not checked voltage between T2 and T4.
I have replaced APS.
I have not checked overheat stat.
I will check these tommorrow. Thanks.

Also mate sure that the inner flue has not corroded where the terminal is.

 

[SavageW]

Pretty sure a profile wouldn’t spark without the case on even with a new APS,sometime trying to simulate enough pressure to operate the switch is not exact enough & trying to see the spark with the case on can be hard to confirm.Try disconnection the HT lead from pcb an using an insulated screw driver near by weather it’s bridging a spark to that. If you’ve got continuity through your lead then there is no reason it should not spark at pilot assembly. Could be wrong but maybe take out pilot injector an check this is not blocked

 

[Michael29068]

Pretty sure a profile wouldn’t spark without the case on even with a new APS,sometime trying to simulate enough pressure to operate the switch is not exact enough & trying to see the spark with the case on can be hard to confirm.Try disconnection the HT lead from pcb an using an insulated screw driver near by weather it’s bridging a spark to that. If you’ve got continuity through your lead then there is no reason it should not spark at pilot assembly. Could be wrong but maybe take out pilot injector an check this is not blocked

thanks for your replie





Thanks for your replies, I have not got back to this boiler yet but I have disconnected HT lead already and checked whether it is bridging a spark and it is not, as for the pilot injector being blocked I am not not getting a spark at the electrode to light the pilot even if it is clear. I seem to get the APS to change over when the fan runs.

 

[jtsplumbing]

You say that you tried another PCB ? was it a used one ? as the second board could be faulty !

 

[Last Plumber]

Pretty sure a profile wouldn’t spark without the case on even with a new APS,sometime trying to simulate enough pressure to operate the switch is not exact enough & trying to see the spark with the case on can be hard to confirm.Try disconnection the HT lead from pcb an using an insulated screw driver near by weather it’s bridging a spark to that. If you’ve got continuity through your lead then there is no reason it should not spark at pilot assembly. Could be wrong but maybe take out pilot injector an check this is not blocked

You’re right. I wasn’t thinking. It’s a positive pressure case isn’t it.

 

[Michael29068]

You’re right. I wasn’t thinking. It’s a positive pressure case isn’t it.

I have tried a new PCB and a new APS

 

[jtsplumbing]

Got to be the fan not running fast enough or you have been unlucky & new board was faulty !

 

[Michael29068]

Got to be the fan not running fast enough or you have been unlucky & new board was faulty !

I am going to try another PCB which I know has come from a working boiler and make sure that the Fan is changing over the Aps

 

[ShaunCorbs]

blow down the aps tube if you can

if it fires fan not spinning fast enough

 

[Harvest Fields]

I am going to try another PCB which I know has come from a working boiler and make sure that the Fan is changing over the Aps

Was the APS from a working boiler?