A SHU43C02UC dates from the early-2000s SHU series, and it is a very different animal from today’s Bosch. It is a Built-in 24″ width run by a mechanical rotary dial, from the days before digital displays and E-codes. Many of these are still working in kitchens two decades on.
Because the machine cannot print a code, owners learn about trouble in one way: every light flashing at once. That is the AquaStop base-pan safety trip, the same event newer models report as E15. A factory test mode exists, but it is meant for technicians.
With age, the usual jobs are drain filter or pump blockages and a worn door latch and gasket. We begin with the base pan and the drain path, then move to the door hardware.
Often, yes. Jobs such as clearing a drain, replacing a latch or fitting a new gasket are routine and cost little at any age, and they typically come in well under the price of a new machine plus installation.
Turn off the water supply and stop running it. This is the base-pan safety trip, and the pan needs to be checked for the source of the water before anyone restarts the machine.
Machines from this era came before Bosch's digital error codes. The all-lights-flashing pattern is the nearest equivalent to E15, and underneath it is diagnosed in the same way.
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