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gthebuilder - when was your last attempted fix? I've had F81 F91 since my 937 boiler was installed in October. Vaillant has got the frequency of the fault right down from the 'every few days' when it was first installed but it still trips out. I had a pump, 2 pcbs and 2 ntcs fitted in February...

Thanks for your reply however I've just sorted it. No great surprise I guess but it was just me being stupid! I hadn't turned the knob all the way back! You get to an area of resistance which i presumed was the end and didn't want to force past, keep on pushing trough that however and you do...

A further thought then, it looks like the storage tanks are tied in with the warmstart feature so its exactly like enabling/disabling the warmstart on Vaillants other combis e.g. the 837. Anyone tell me exactly how they do this? I've tried all different combinations of quickly turning the dial...

Hi all, this is my first post but I've lurked for a while, I must have read every post on the 937 before committing to one! The boiler was put in a few days ago and is working very well, my rough measurements/calcs suggest I'm getting around 17 l/min out of it at a dt of 35C, not to shaby...