A 3 pound chuck should have cooked faster than what you did, but, 225F is slower than I generally cook. I am sure you need to check the probes and make sure they register temps properly. Fill a glass with ice, and then add water, stir as if making a cocktail. Put the probes into the water for 30 seconds and it should read 32F or close.
the meat thermometer was so far past the top reading, it read Taylor
"perhaps...but then again...maybe not..."