My Suprima 100 locks out every couple of days. The pump keeps working but I have to reset somtimes two or three times before it fires in. This also happens when the boiler is off on the time clock but the pump is running. I then have to reset to turn the pump off.

Any ideas?

Alan Roberts, December 2009

The printed circuit board has probably failed, this model was featured somtime ago on a BBC Watchdog program, as a really bad buy and for sometime Potterton were embarrased enough to replace them for free. However the replacement PCB now costs over one hundred pounds. If your handy with a soldering iron, the joints on the rear of the PCB can be resoldered, but it's not a job for an amateur and you've got to know what you're looking for.
Probably best to buy a new PCB but this now incorporates the whole wiring loom and a lot of work.
Bite the bullet, get a professional and be warm for Xmas.

Combi Cure, Liverpool, December 2009