3 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Minor
CL key-lock display on SN55ZS07CE can be held on by a damaged membrane keypad
This error-code reference page explicitly names the iQ500 SN55ZS07CE for the CL (key-lock) display. In most cases CL is just the child lock being on, but the page notes a rare electrical fault: a damaged membrane keypad sends a continuous press and holds the lock on.
What to check. If the machine shows CL and the lock cannot be cleared by holding the key symbol for ~3 seconds, suspect the control-panel membrane keypad rather than the lock logic — a control-module repair, not a user error.
Food residue on dishes in SN55ZS07CE traced to incorrectly seated filters (manual)
From the manufacturer's own user manual for the iQ500 SN55ZS07CE (page 53). The official troubleshooting table lists food residue on dishes with the cause 'filters incorrectly seated and/or not latched' — the brand's own documented recurring issue for this model.
What to check. A routine, user-fixable cause: if dishes come out with residue, first check the filters are correctly seated and latched before assuming a bigger fault. This is the brand's own first-line diagnosis for this model.
Loose deflection-chamber cover (part 12042749) found inside SN55ZS07CE
An owner of this exact model found the plastic cover of the deflection chamber (part 12042749) had come loose inside the machine and was lying on the floor of the tub, and could not work out where or how to remount it.
What to check. A small internal part can detach in normal use; it is a low-severity assembly defect, not a functional failure, but the owner had to find the correct mounting position to refit it. Check the interior after any unusual rattle.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Dishwashers catalog, version 0.1.2, under the CC-BY-SA-4.0 license.
