Wth most washing machines you do not need to reset any error code. Another code is displayed when there is a fault, and as soon as this fault is repaired the error code no longer displays. Simply cancelling or resetting an error code will only see it return if there’s a fault that hasn’t been fixed.
However, it seems that even after some faults have been repaired, some AEG washing machines can still display the error code until it has been reset. This is only a problem if you’ve fixed the fault yourself though, because clearly any engineer would do this for you.
Looking into this for a Washerhelp forum user recently I found that the following procedure may work with some (older?) Lavamat models –
You have to run the “test” cycle. With the switch in the off position, hold in the Pre wash & soak button and then turn the rotary knob to gentle (or short) spin. Presumably this should run a short test sequence and clear the error.
His reply was “.. the instructions you gave were correct, but to reset my machine I had to hold the same 2 buttons but turn the rotary knob clockwise to the Energy Saving position”.
Find appliance repairs – Book washing machine (or other appliance) repair