Printer Prints but Won't Scan After a New Router?

/01 — THE SYMPTOM

Prints fine, won't scan — why the new router breaks only half the machine

You've had a new router — perhaps with a broadband switch — and now the printer happily prints everything you send it, but scanning to the computer has stopped dead. The scan button errors, says no computer was found, or the scanner software insists the printer is offline. It feels absurd: how can half the machine be connected?

The answer is that printing and scanning travel in opposite directions. When you print, your computer finds the printer. When you press Scan on the printer, the printer has to find your computer — and it does that using network "discovery" chatter that new routers frequently block, or that breaks when the new router hands out different addresses than the old one did. Below we'll check you're genuinely on one network, fix the settings that quietly block discovery, re-register the scanner properly on the computer, and — if all else fails — set up a scan method that doesn't care what your router does.

/03 — HIDDEN BLOCKERS

Two settings that silently block scanning

Two settings cause most of these cases, and neither produces a helpful error message.

First, isolation on the router. Many new routers ship with a setting called AP isolation, client isolation or WiFi isolation — sometimes it's simply how the guest network behaves. It stops wireless devices talking to each other, which is exactly what scan-to-computer needs to do. Log into the router's settings and look for that wording; where it lives differs by make and model, so we'd rather name the setting than invent a menu path. While you're there, make sure the printer isn't sitting on the guest network.

Second, the Windows firewall profile. When your computer meets a new router, Windows treats it as a brand-new network and often marks it "Public" — a cautious mode that blocks incoming connections, including the printer announcing it has a scan for you. In your network settings, set your home network to Private (the exact wording moves between Windows versions). That one change fixes a surprising share of these calls on its own.

/05 — THE STURDY WORKAROUND

Scan to email: the method that ignores your router

There's a version of scanning that simply doesn't care what your router blocks: scan to email. Set up on the printer itself, it sends each scan as an email attachment, so the printer never has to find your computer at all. Once configured it survives router swaps, new laptops and network changes untouched — plenty of our customers switch to it permanently after one of these episodes. Most modern multifunction printers support it, though setup varies by brand and some need an email account's app-password before they can send.

Two more sturdy alternatives. Scan to a USB stick, if the printer has a port, needs no network at all — walk the stick to the computer. And driving the scan from the computer — opening the scanner app on your PC and starting the scan there, rather than pressing the button on the printer — reverses the direction of the conversation, and often works even while the printer's own scan button is still failing. One honest caveat: scan-to-email survives router swaps only when it is set up with a provider-independent account (a Gmail or Outlook.com address, say). If it was configured against your old broadband provider’s email servers, changing provider breaks it too — re-point it at an independent account and it stays fixed.