FLD Xenon Lamp Change Error Message: Lamp cover is open


I have replaced my FLD Xenon Lamp and upon connecting it back to the HPLC, the following error message comes up on Lab Advisor: 'Lamp cover is open', accompanied by a red light on FLD module (G1321B).

I am pretty certain that everything is connected as it was, and that the lamp cover is the big metal case that contains the trigger pack, xenon lamp etc. (held down by 5 bolts).

As far as I am aware, it is not open. 

Does anybody know what might be causing this error message? Is it automatically issued when you remove this cover? I already know a service engineer should be the one doing this lamp replacement so please don't remind me of this, I am just looking for the probable cause and hopefully a solution.

Many thanks! :) 

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