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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...

Been looking at PCB photos, is the circled bit where the jumpers are set ?

Thanks, appreciate your input. I'll contact my boiler guy, hopefully he'll know what to do.

Thanks for the quick response - he didn't keep the old PCB. Boiler is around 10 years old. Are jumpers available separately and will he know which jumper to move without having the old PCB ? Boiler guy is very busy at the moment is this something that can be done on a DIY basis ?

Trying to resurrect the old thread, hopefully somebody will respond - I'm having a similar problem and the last comments on this thread may be relevant in my case. Background, a couple of days ago my Vaillant Turbomax plus 828E got locked out with f29 error which subsequently changed to f28, got...