Vaillant ecoTEC 438 missing fault codes

[BFS]

Hi I have the ecoTEC 438 and it seems fine.
I am trying to display d.80 which is "Heating operating hours"
but when scrolling through the first diagnostic d codes it jumps from 76 to 90
ie no 80, 82, 83, 84 etc.

Can anybody through some light on this.

Thanks BFS

 

[Deleted member 105431]

enter 17 into d97 first.

 

[BFS]

Many thanks dangermouse

Your info for secret code display works fine but now I have spent some time with the manual I see
that Vaillant offer a PC link to the boiler.

It is the vrDIALOG 810/2

Vaillant say it " is intended for heating engineers and ambitious owners "

I am not quite sure what an ambitious owner is but do you ( or anybody) have experience with this gizmo and is it worth the effort.
Can it help shave a few quid off the running and maint. cost?

Regards BFS

 

[Corgigrouch]

Ambitious owners are to be discouraged at all costs...

Fortunately Vaillant also have a code to reset the boiler to its default settings.