My 6o amp breaker keeps tripping after about 15 minutes of running my electric heater. It is the kind that is in a closet in a mobile home. It ran fine last winter and suddenly started tripping breaker. The heater is fairly new, about 4 years old. I am trying to pin point the problem so I can fix it myself due to lack of funds. Any suggestion please!

Knowing the size heater in wattage would be helpful.

It is possible the breaker is either overloaded, or defective, or there is a loose connection at the breaker.