Hi There: 
Welcome to TuDiabetes. We’re Happy to see you here.
If George’s pump is working okay and there is no occlusion or kinked cannula, etc. then he could have an infection but may not have symptoms of it yet. Of course, having high blood sugar can be a symptom of an infection. Or perhaps he ate something that was high in carbs and forgot to bolus for it or did not bolus enough Insulin.
I do hope that his sugars are soon back in the Good range and that he will be feeling Well again.