Many times when I'm preparing to land that yellow master caution light comes on, but it seems there is nothing wrong thith the configuration. Why does that happen?

 

Thanks,

May have something to do with the cabin pressure settings.

What error do you see lit up when it comes on?

Make sure you set the landing altitude correctly on the overhead panel. This is the most common cause of the MC light coming on for me.

Each time master caution light comes on it will tell you what is wrong, near each of hem there is a rectangular box (called master caution recall) wich illuminates the system who generated the problem. You will simply need to check in that position on the overhead to find an amber light.

Take a look on both of the Captains and First Officer's sixpack (the rectangular box the the side of the MC and FW cut outs)

 

 

Matt