If your Traeger fan is bad, you'll likely notice that your grill isn't working as well as it used to. The fan helps circulate air in the grill, so if it's not working properly, the grill won't function as efficiently. You may also notice that the fan is making noise or vibrating more than usual. If you suspect that your fan is bad, you can test it by disconnecting the power and then starting the grill. If the grill doesn't start, or if it starts and then shuts off after a few minutes, the fan is likely bad and needs to be replaced.