Start with the machine, not the number. The two code sets on this make share a shape and mean entirely different things: the dishwashers use F followed by a digit, the refrigeration uses E followed by a digit or a letter, and there is no relationship between them beyond the alphabet. Every page in this archive names the appliance in its own title for that reason.
On the dishwashers the table is genuinely useful and the maker’s own instructions and ours agree. FF is water not arriving and the inlet hose filter is the first thing to clean. F2 is water not leaving, and the filter housing and the sump are where a large share of those calls end — both are removable by hand and neither needs a technician. F1 and F3 are the two that mean stop: an overflow and a machine filling when it should not, and the right response to either is to close the tap rather than to run another cycle. HI is not about the dishwasher at all — it is the electricity supply reaching it.
On the refrigeration the E-numbers are sensing problems, and the maker’s own note beside the table is worth repeating: the appliance will usually go on cooling and freezing while showing one. That makes them urgent in a different way — not “the food is at risk tonight” but “this machine has lost the ability to measure itself and will drift”. dr is not a problem at all: it is a door that has been open too long, and a machine showing it with the door apparently shut is describing an alignment problem rather than a sensor.
Everything else in this kitchen signals. The hoods flash when their filters are saturated, and each family does it differently enough that the pattern matters more than the fact. The water filters count days rather than measuring anything, which is why the counter has to be reset by hand after a change. And the gas equipment — the ranges this maker is known for, the gas ovens, the rangetops — says nothing whatsoever, forever. That is the shape of this make, and a site that pretended otherwise would be easier to write and worse to trust.