“If you are ordered to appear at a Magistrate’s hearing for a violation and do not or cannot appear (the owner of the property is elderly and is not ambulatory) what are the repercussions”

Not showing up for a hearing can be extremely serious, and have very severe repercussions, including defaulting, and having the court award to the other side whatever they ask for, having default judgements entered against you, and more.

If you or someone you know is unable to attend a hearing, they should retain an attorney to appear on their behalf (they should retain an attorney in any event, but in this situation the attorney can make the appearance, and explain the situation to the judge.