Bosch fitted the SHEM78ZH5N with CrystalDry as well as PureDry, and with Home Connect Wi-Fi, so it counts among the earliest American Bosch machines to carry a zeolite module. It belongs to the SHEM generation of the 800 Series, with a 42 dBA rating, a deep tub for 16 place settings, and a RackMatic third rack.
That gives us a useful reference, since zeolite drying has been in the field long enough to build up a service record. In our experience the mineral itself has not been what fails.
Instead we examine the fan, the duct and the small flap that opens onto the module. Racks and door springs wear in the ordinary way for a machine this age, and we test each of those on the same visit.
Not that we have seen. Each cycle's heat restores the mineral. The occasional casualty is the blower, or the passage that brings air to the module.
A slow decline normally means airflow, such as a partly blocked duct or a tired fan, and not a part that has abruptly failed. It is a focused check.
Do not poke at it. If you can see debris at the grille, switch the machine off and unplug it, then ask us to clear the duct properly so nothing is pushed deeper.
Book in about a minute, or call the desk. Same-day windows inside the Loop on most days, next-day across the rest of Houston.