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:lol: Success! Most of the connector pins and half of the relay pins were cracked, re-flowed all of them and now its been working for week without tripping. Thanks for the info. saved me money and hassle. I also informed Potterton that with this many failures it is a design/manufacturing...

:oops: Sorry all Just did the search on 'Suprima' and realised that my intermittent problems could well be explained by dry/cracked solder joints on the pcb. I'll let you know what happens.

I also have a Suprima 50 with exactly the same fault you describe, only it can trip out within 10 minutes of being reset. Unfortunately because it is so intermittent I have only witnessed it once, where I think the solenoid may not have energised, as I didn't hear a click, but it alwayts...