Wouldn't think of doing it myself - I'm just thinking my engineer should have known this when he replaced the PCB. When I spoke to him earlier he didn't think it was anything to do with the PCB although that is the only component that has been changed. He was suggesting a system flush would cure the problem. The water was scalding hot before the lockout so it seems logical that it maybe something to do with the PCB especially since you've mentioned the jumper settings. Just want to point the engineer in the right direction and get him to check the jumpers, that's all. Just been informed by the missus, the radiators are also not hot !
I often put dates etc on a pcb for future reference. Tony why do you look down your nose at other folk who carry out work. You hardly ever have anything pleasant to say about a fellow engineerDepending on the engineer, unless he specialises in Vaillants then he is likely to need to look it up.
If I am right that its a repaired PCB as evidenced by the writing on it, then did you know that it was a repaired one?
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