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This OEM step-down transformer (part# P201-35150) is the factory-specified replacement for the Carrier YAC60140YAC202AT. The transformer converts high-voltage line power (120/208/240 VAC) down to safe low-voltage output (12/24 VAC) to energize the system's control board, thermostat circuit, and all low-voltage switching devices. When this transformer fails, the entire control circuit loses power — symptoms include a completely unresponsive thermostat, a system that won't call for heating or cooling, or a blown low-voltage fuse that keeps returning.
Compatibility: Confirmed fit for Carrier model YAC60140YAC202AT. Verify primary voltage matches your unit's supply voltage (120V or 208/240V) on the equipment data plate before ordering. Cross-reference part number P201-35150 or Totaline HCTY156D0LS11102. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions.