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This is the OEM factory-specified control transformer for the Carrier PY3PPA060130NA packaged unit. The transformer steps down line voltage from 208/240V to the 24V DC signal that powers your thermostat, control board, and low-voltage control circuit. When this part fails, the entire low-voltage system goes dark — your thermostat becomes unresponsive, relays won't energize, and the unit will not heat, cool, or operate in any mode. A failed transformer is one of the most common causes of a completely unresponsive HVAC system and is often misdiagnosed as a thermostat or control board failure.
Compatibility: Engineered as the direct OEM replacement for Carrier model PY3PPA060130NA. Verify your unit's data plate shows a 208/240V primary control circuit before ordering. Not sure if this is the right part? Contact our HVAC parts specialists — we confirm fitment before you buy.