The code on the display,
in plain English.

A code is the most specific thing you can hand a technician before they arrive, and it is the thing that is hardest to look up without landing on a forum arguing with itself. So here is the whole set, brand by brand: what the machine detected, what causes it, and whether it genuinely needs anybody.

Of the 86 codes below, 37 do not need a call-out at all. Some of them are not faults in the first place — a child lock, a showroom mode, a measurement of your dryer duct. We would rather tell you that here than charge you to hear it in your kitchen.