Potterton Suprima lock out problem - overheat stat?

[sparkybird]

Hi there

Hope someone can help!

Power was switched off to the boiler today and at switch on, it wouldn't re-ignite. Pressing the reset button resulted in unsuccessful tries then then 'lock out'. I read in the literature that switching off the power could result in the overheat stat operating - so I'm guessing that it might be this. Is there an easy way to re-set it? Can this be done by a sparks or does it need to be gas safe?
The boiler was pretty cold when I tried to restart as it had been off all day
Thanks

SB

 

[simond]

New circuit board......

Poxi Batterton electronics again. Did you do an insulation resistance test?

 

[simond]

I'm assuming you are a sparks? If the polarity was reversed to the boiler you would get precisely the problem you describe......

 

[sparkybird]

Thanks Simon

BTW I should have mentioned it's not my boiler!

Do you mean IR test on boiler??? No. But I IR tested the circuit with the boiler isolated.

Customer moved in just before Christmas and # mentioned that they had had to reset it once or twice.

Is there a way to check the overheat thermostat first, before getting PCB replaced? I gather they ain't cheap...