A standard residential doorbell transformer typically lasts between fifteen and twenty-five years under normal operating conditions, though older conventional setups can occasionally function for decades. However, when modern smart video doorbells like Ring or Nest are installed on older, underpowered transformers, the continuous power draw and battery trickle-charging demands can cause the transformer to overheat and fail prematurely, sometimes within just a few years. You can troubleshoot electrical component age easily by checking installation history. You can verify that your hardware is healthy when testing low-voltage output with a multimeter confirms steady performance.
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