A transformer is an electrical device that changes an input voltage to a different output voltage. The change is either an increase or decrease. They work through the process of electromagnetic induction. Electromagnetic induction is where an alternating electric current is run through a wire and an invisible moving magnetic field is created around the wire.
You should replace your transformer if it has reached its lifespan. They typically last around 20 to 30 years. You should also replace them if they begin to deteriorate and have performance issues. The following are the signs you should look for to determine if your transformer needs replacing: