Brother L2540-DW - Can scan wirelessly. But can't print.

On MacBook (MacOs 10.12.5), Printers and Scanners sees the printer. Brother L2540-DW multi-function printer.

Says "Toner Low. Last used ...."

Can scan wirelessly no problem.

When I go to print, Printer Queue dialog says "The printer is not connected". Jobs are stuck in queue with "Looking for printer" message.

Have tried turning on/off printer. Not sure what else to do as clearly printer is connected to Wifi AND it can communicate to laptop for scanning. Was working fine last week and haven't changed anything since then.

Thoughts?