T490 fan error. Should I refund?

So I got a used t490 off eBay for like $170 and the seller claimed the only issues it had was a few minor scratches and scuffs. I turned it on as soon as I got it and it ran fine, The second time I turned it on I got the fan error. I've bypassed it a couple times to do some light browsing and its worked fine.

I'm fairly confident in my ability to replace the fan, but I've also been reading that it could have something to do with the port (or something) so my question is should I try to replace the fan or just get a refund and start all over?

The vendor had thousands of sales and a lot of good reviews so Im kinda bummed out. I also got Lenovo vantage and saw that the battery had been charged roughly 900 times so I figured that might be another issue. Advice would be greatly appreciated