uECD detector outputting 844833.8 Hz

You have a leak or a loose electronic connection somewhere.

Also the nitrogen could be off or the tank empty.

Hi jsinolinding thank you for asking this question. 

Agilent recommends you contact your local support team for on-site assistance with this problem. 

Before proceeding with any maintenance and/or repair, always refer to the applicable Agilent instrument safety information. 

Cheers,

Kristen