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Why does my potterton gas boiler keep locking out?

My potterton gas boiler keeps locking out while the system is going. It will correct as soon as I press the reset button but I have to keep checking it. This happens several times a day.
Anna Shaw, October 2008
Mine is doing the same and an Engineer has just advised that the PCB has broken. This is a replacement of an earlier PCB. The second in 7 years?

RR, October 2008
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