Air conditioning transformers are essential components for proper system function. They power the thermostat and regulate the current sent to it. That’s essential because a current that’s too high could damage the system, but the air conditioner won’t get enough power to function if it's too low. Troubleshooting air conditioning transformer issues requires a methodical approach. Here are some things to consider when doing it.
The transformers used for air conditioners are the low-voltage variety. One of the first steps is to see whether power is reaching the faulty transformer. Technicians can do that with a volt-ohm-milliammeter (VOM), which measures the voltage, resistance, and current. The transformer should get 12-24 volts of alternating current at its output screws.