OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF4MNA025T00ABAA

This is the OEM factory-specified control transformer for the Carrier PF4MNA025T00ABAA air handler. Part number HT01CN241 steps down 208/230V line voltage to the 24V AC signal that powers the control board, thermostat circuit, and all low-voltage switching functions throughout the system. When this transformer fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and no safety outputs will energize. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing more expensive components.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | Direct OEM replacement for Carrier part HT01CN241 | Class 2 control transformer
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for your specific system. Undersized or off-spec generic units can cause nuisance tripping, blown fuses, or premature control board failure due to voltage sag under load.
• Install Difficulty: 2/5 — Turn off all power before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wire connections before disconnecting. Confirm secondary output reads ~24V AC after installation before restoring full power.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Designed as the factory-matched replacement for Carrier model PF4MNA025T00ABAA. Always verify the transformer VA rating and primary voltage on your unit's data plate before ordering to ensure exact fitment. Have a question about compatibility? Our HVAC parts specialists confirm fitment before you buy — reach out today and get your system back online fast.