AEG [C4] fault codewhat it means and how to fix it

C4 has one advantage over the other three C codes: it is unambiguous. AEG’s pyrolytic cleaning menu names only three cycles, C1 through C3, so there is no C4 cleaning option for this to be mistaken for. Whatever else is going on, a C4 on the display is the fault. The fault itself is straightforward and the instruction for clearing it is not.

The oven will not begin a pyrolytic clean while its steam function is engaged, and turning that function off clears the code. The difficulty is finding the control, because AEG name it twice and differently in a single article: the prose calls it the "Steam Bake Button" and tells you it is lit when active, while the table immediately below calls it the "Plus Steam button" and, within one table row, spells it both Plus Steam and Plus steam.

An owner looking along the fascia for a button marked Steam Bake when the panel actually says Plus Steam will conclude their oven does not have one. Both names are AEG’s. The physical control is the same. The useful detail buried in the prose is the tell: whatever it is labelled, the button carries a small indicator light, and that light being on is how you know the function is active.

1. 1

   Look along the fascia for a button with a small light showing in it. Ignore what it is called — the lit indicator is the reliable identifier here, not the wording.

2. 2

   Press it once to deselect. The light in the button should go out, which is AEG’s stated confirmation that the function is off.

3. 3

   Start the pyrolytic programme again.