CRJ-200 Captain reported multiple aircraft alerts during climb related to an air/ground switch malfunction. The flight returned to the departure airport.

Narrative

Our aircraft alerted us to multiple malfunctions and messages. These included a nosewheel steering failure and two WOW weight on wheels/weight off wheels messages. One of these messages was an amber WOW INPUT caution message. The other was a WOW OUTPUT FAIL status message. While climbing to an altitude of 28;000; these three messages occurred. The captain-pilot monitoring performed a more detailed WOW OUTPUT caution message precedure in error; leading to manual pressurization control. Although the aircraft would have returned to the field; it was not necessary to accomplish manual pressurization control. We requested priority handling due to the nosewheel steering failure and weight on wheels sensing issues.Cause: Although the captain saw WOW input (amber caution) and WOW output (white status) messages; the captain ran the checklist for a WOW output caution message. These were a processing and perception errors due to the wording of similar yet different messages and procedures. Suggestions: These captain should have slowed down; verified the messages and the emergency quick reference checklist procedures; and perhaps crosschecked the processing and perception with the first officer pilot flying for a moment to ensure certain and accuracy of the information and irregularity displayed.