Stephen, Fan 1 is shown below. What you need to do is try reseating the fan first to see if it may have been a poor connection.  [IMAGE] Let me know how it goes. 
Hi all Our Poweredge 2800 has just started making a loud fan noise, has a flashing amber light and the LCD displays ‘Fan Redundancy Lost PowerEdge 2800 rpm Fan 1' What is the best course of action to resolve this? Do I just assume Fan 1 has failed and replace it? If so how do I identify which is Fan 1? Many thanks, Stephen
‘Fan Redundancy Lost PowerEdge 2800 rpm Fan 1