OEM Carrier Transformer 120V–24V 40VA for Model PF1MNC031T00AAAA

This is the OEM factory-specified control transformer (part number HT01CN241) for the Carrier PF1MNC031T00AAAA. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuitry. When it fails, the entire control circuit goes dark — your thermostat shows no power, the system won't respond to any call for heating or cooling, and no fault codes are displayed. It is one of the most overlooked root causes of a completely unresponsive HVAC system.

• Specs: 120V primary | 24V secondary | 40VA rated | Replaces OEM part number HT01CN241 | Factory-matched footprint for drop-in installation
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications for VA rating and thermal protection. Generic units often run under-rated, causing nuisance tripping or premature failure when control boards draw near full load.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Always check for a short on the secondary (24V) circuit before installing a new transformer — an unresolved short will immediately blow the replacement.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Directly replaces the factory transformer on Carrier model PF1MNC031T00AAAA. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the unit's data plate or wiring diagram before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy.