Direct answer
A printer problem limited to one sender, document, tray or media type should be repaired at that boundary, not with a factory reset. For AirPrint or Mopria discovery, first place phone and printer on the primary LAN, disable VPN for a test and refresh discovery.
What this covers
- AirPrint or Mopria discovery with this exact failure state
- Diagnosis across printer service versus guest isolation, VPN, multicast and stale IP
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleName the failing sender, document, tray or paper type and one combination that still prints correctly. Expected behavior: advertise the printer on the same local network to supported mobile devices.
Isolate the component boundary
ReversiblePlace phone and printer on the primary LAN, disable VPN for a test and refresh discovery. Change only the sender, job, tray, media or connection while keeping the printer state unchanged. Boundary to separate: printer service versus guest isolation, VPN, multicast and stale IP.
Correct only the proven cause
ReversibleCorrect network isolation or update printer firmware without resetting working print settings. Repair the isolated queue, document, tray setup, media selection or connection.
Verify and stop safely
ReversiblePrint the same controlled test from both the failing and known-working contexts. Do not weaken the firewall or expose discovery ports to the internet.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when AirPrint or Mopria discovery has this problem?+
Place phone and printer on the primary LAN, disable VPN for a test and refresh discovery.
Why not factory-reset immediately?+
The useful boundary is printer service versus guest isolation, VPN, multicast and stale IP. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
do not weaken the firewall or expose discovery ports to the internet.
Answer for the exact device and software version shown above.