If there is no voltage there then the transformer itself is faulty and you need to replace the transformer.
Do low voltage transformers go bad. Transformers are usually connected to a receptacle outside the house. Usually a transformer fails only after another part in the electrical circuit shorts to ground or draws an unusually high amperage. When converting AC power to a lower voltage of AC theres not much involved beyond wire windings.
Not all electronic transformers are defective right out of the box. Most transformers will NOT generally fail short to ground there is a lot of insulation there. Herein how can you tell if a transformer is bad.
Low voltage landscape lighting primarily uses 12 volts but 24 volt systems are also available. The meter should give the same resistance reading results in ohms for the low side. So its not like theres never a high-voltage risk when installing low voltage.
Low-voltage transformers do not wear out. Most of the time the furnace transformers will stop working because it couldnt convert the right voltage to start the ignition controls and timers. Most transformers will NOT generally fail short to ground there is a lot of insulation there.
Tripped Circut Breaker When the transformer of your HVAC unit goes bad the circuit breaker will usually trip. But just in case be sure to also go look and see if your lights are on. Follow the same procedure on the low side connections.
So those devices properly called transformers often last decades. The only thing that causes a transformer to go bad is the windings burning up. If youve managed to restore power to the outlet for your transformer open your transformer up and hit your control timers on switch.

