Had a laserjet from Brother in the house for the last 4 years. Not massively heavy users but moved away from inkjet during lockdown for reliability. To be fair, it has worked very well until now, when it has started showing a "No Toner" error. Printer showing all cartridges as 40% plus full. Printer also notices if you take any of the cartridges out, so it can see the cartridges fine.

Looking on line, this seems to be a common error. I tried the stuff suggested on line to no avail, so I contacted the web chat. Went through various diagnostics but, while off verifying one of the things (are the cartridges genuine) the agent signed off by leaving a link to replace the cartridges. £330. New printer £350...

So I went back on and got a different agent. Seems it might be that the toner cartridges are too old. 38 years working and never heard that one before.

No input on finding out if one or all are not working.

"If I buy new cartridges and the printer still doesn't work, do I get a refund?"

"We can escalate that." No "yes or no".

So I could spend £300 on new toner and find out the error is actually with the printer, with no guarantee of getting the £330 back if it turns out its a problem with the printer rather than the toner cartridges.

Given how common the error seems to be you'd think they'd be adept at diagnosing the exact cause of the problem.

Maybe they're just more interested in punting consumables?