The firmware for CN5000 Switches is the same whether they are air-cooled or liquid-cooled. During start-up/boot of a liquid-cooled switch, you may see the following message:

[FAILED] Failed to start Fan Sensor.

Liquid-cooled switches do not have a Fan Sensor, therefore, you can ignore this message.

Note also that if you perform a hardware check --verbose, you may see an indication that the Fan Trays are “On”, “Green”, and “Good”. These indications can be ignored as well.